299 lines
11 KiB
JavaScript
299 lines
11 KiB
JavaScript
// ════════════════════════════════════════════════════════════════════════
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// almanac-calendar.js — Extended event calendar for the "What's Coming"
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// panel and getUpcomingEvents() export.
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//
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// Includes all events from COSMIC_CALENDAR plus multi-year entries.
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// Each entry has a `latHint`:
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// null = global / no hint
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// 'north' = better from northern latitudes
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// 'south' = better from southern latitudes
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// 'path:...' = specific eclipse path note
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// ════════════════════════════════════════════════════════════════════════
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export const ALMANAC_CALENDAR = [
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// 2026 events (covers rest of year from today)
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{
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id: 'lunar-eclipse-2026-mar',
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emoji: '🌕',
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title: 'Total Lunar Eclipse',
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desc: 'The Moon turns deep red as it passes through Earth\'s shadow. Visible from Europe, Africa, and the Americas.',
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start: '2026-03-03', peak: '2026-03-03',
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color: '#3a0a0a', textColor: '#ffd8d8',
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latHint: null,
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type: 'eclipse',
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},
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{
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id: 'lyrids-2026',
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emoji: '☄️',
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title: 'Lyrid Meteor Shower',
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desc: 'Up to 20 meteors/hour at peak. Active Apr 16–25, best after midnight from a dark site.',
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start: '2026-04-16', peak: '2026-04-22',
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color: '#2a1a5a', textColor: '#e8d8ff',
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latHint: 'north',
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type: 'meteor',
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},
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{
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id: 'eta-aquariids-2026',
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emoji: '☄️',
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title: 'Eta Aquariid Meteor Shower',
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desc: 'Debris from Halley\'s Comet — up to 50/hour before dawn. Best from southern latitudes but visible worldwide.',
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start: '2026-04-19', peak: '2026-05-06',
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color: '#2a1a5a', textColor: '#e8d8ff',
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latHint: 'south',
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type: 'meteor',
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},
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{
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id: 'mars-conjunction-2026',
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emoji: '🔴',
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title: 'Mars & Venus Conjunction',
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desc: 'Mars and Venus appear strikingly close in the evening sky — a beautiful naked-eye pairing.',
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start: '2026-06-30', peak: '2026-07-01',
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color: '#2a1520', textColor: '#ffc8d8',
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latHint: null,
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type: 'planetary',
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},
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{
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id: 'perseids-2026',
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emoji: '☄️',
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title: 'Perseid Meteor Shower',
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desc: 'One of the best showers of the year — up to 100/hour at peak, no need for a telescope.',
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start: '2026-07-17', peak: '2026-08-12',
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color: '#3a1a00', textColor: '#ffe8c0',
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latHint: 'north',
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type: 'meteor',
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},
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{
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id: 'solar-eclipse-2026-aug',
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emoji: '🌑',
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title: 'Total Solar Eclipse',
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desc: 'The path of totality crosses Spain, Iceland, and Greenland. Partial eclipse visible across most of Europe.',
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start: '2026-08-12', peak: '2026-08-12',
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color: '#1a0a2a', textColor: '#d8c8f8',
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latHint: 'path:Spain, Iceland, Greenland — partial eclipse across UK & Europe',
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type: 'eclipse',
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},
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{
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id: 'saturn-opposition-2026',
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emoji: '🪐',
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title: 'Saturn at Opposition',
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desc: 'Saturn is at its closest and brightest — rings tilted beautifully toward Earth. Visible all night.',
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start: '2026-09-23', peak: '2026-09-23',
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color: '#1a2a3a', textColor: '#c8e8ff',
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latHint: null,
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type: 'planetary',
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},
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{
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id: 'orionids-2026',
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emoji: '☄️',
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title: 'Orionid Meteor Shower',
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desc: 'Fast, bright meteors from Halley\'s Comet — up to 25/hour. Active Oct 2 – Nov 7.',
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start: '2026-10-02', peak: '2026-10-21',
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color: '#2a1a5a', textColor: '#e8d8ff',
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latHint: null,
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type: 'meteor',
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},
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{
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id: 'jupiter-opposition-2026',
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emoji: '🪐',
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title: 'Jupiter at Opposition',
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desc: 'Jupiter at its closest — you can see its cloud bands and four Galilean moons with binoculars.',
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start: '2026-10-08', peak: '2026-10-08',
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color: '#1a2a3a', textColor: '#c8e8ff',
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latHint: null,
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type: 'planetary',
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},
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{
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id: 'leonids-2026',
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emoji: '☄️',
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title: 'Leonid Meteor Shower',
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desc: 'Fast, bright meteors from comet Tempel-Tuttle. Up to 15/hour at peak.',
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start: '2026-11-06', peak: '2026-11-17',
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color: '#2a1a5a', textColor: '#e8d8ff',
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latHint: null,
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type: 'meteor',
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},
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{
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id: 'geminids-2026',
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emoji: '☄️',
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title: 'Geminid Meteor Shower',
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desc: 'The finest shower of the year — up to 150 meteors/hour, visible even before midnight.',
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start: '2026-12-04', peak: '2026-12-13',
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color: '#3a1a00', textColor: '#ffe8c0',
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latHint: 'north',
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type: 'meteor',
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},
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{
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id: 'ursids-2026',
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emoji: '☄️',
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title: 'Ursid Meteor Shower',
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desc: 'A quieter shower near the winter solstice — circumpolar, so best from northern latitudes.',
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start: '2026-12-17', peak: '2026-12-22',
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color: '#2a1a5a', textColor: '#e8d8ff',
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latHint: 'north',
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type: 'meteor',
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},
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// ── 2027 ─────────────────────────────────────────────────────────────
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{
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id: 'quadrantids-2027',
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emoji: '☄️',
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title: 'Quadrantid Meteor Shower',
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desc: 'Up to 120 meteors/hour at peak — one of the strongest showers but with a very sharp peak. Best in the hours before dawn on 4 Jan.',
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start: '2027-01-01', peak: '2027-01-04',
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color: '#2a1a5a', textColor: '#e8d8ff',
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latHint: 'north',
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type: 'meteor',
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},
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{
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id: 'annular-solar-eclipse-2027-feb',
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emoji: '🌑',
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title: 'Annular Solar Eclipse',
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desc: 'A "ring of fire" eclipse visible from parts of South America, Africa and the Indian Ocean. Partial eclipse across much of the southern hemisphere.',
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start: '2027-02-06', peak: '2027-02-06',
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color: '#1a0a2a', textColor: '#d8c8f8',
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latHint: 'path:South America, southern Africa, Indian Ocean',
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type: 'eclipse',
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},
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{
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id: 'mars-opposition-2027',
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emoji: '🔴',
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title: 'Mars at Opposition',
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desc: 'Mars is at its closest and brightest — a vivid red beacon visible all night long. Good binoculars reveal its distinct colour.',
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start: '2027-02-19', peak: '2027-02-19',
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color: '#2a1520', textColor: '#ffc8d8',
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latHint: null,
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type: 'planetary',
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},
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{
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id: 'lyrids-2027',
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emoji: '☄️',
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title: 'Lyrid Meteor Shower',
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desc: 'Up to 20 meteors/hour at peak. Note: bright waning gibbous moon may reduce visibility this year. Active Apr 16–25.',
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start: '2027-04-16', peak: '2027-04-23',
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color: '#2a1a5a', textColor: '#e8d8ff',
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latHint: 'north',
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type: 'meteor',
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},
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{
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id: 'eta-aquariids-2027',
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emoji: '☄️',
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title: 'Eta Aquariid Meteor Shower',
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desc: 'Debris from Halley\'s Comet — up to 50/hour before dawn. New moon on 6 May means excellent dark skies this year.',
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start: '2027-04-19', peak: '2027-05-05',
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color: '#2a1a5a', textColor: '#e8d8ff',
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latHint: 'south',
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type: 'meteor',
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},
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{
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id: 'perseids-2027',
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emoji: '☄️',
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title: 'Perseid Meteor Shower',
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desc: 'One of the best showers of the year — up to 100/hour at peak, no telescope needed. Active Jul 17 – Aug 24.',
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start: '2027-07-17', peak: '2027-08-13',
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color: '#3a1a00', textColor: '#ffe8c0',
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latHint: 'north',
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type: 'meteor',
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},
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{
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id: 'total-solar-eclipse-2027-aug',
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emoji: '🌑',
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title: 'Total Solar Eclipse',
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desc: 'One of the longest total solar eclipses of the century. Path of totality crosses Morocco, Spain, Algeria, Libya, Egypt and Saudi Arabia.',
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start: '2027-08-02', peak: '2027-08-02',
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color: '#1a0a2a', textColor: '#d8c8f8',
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latHint: 'path:Morocco, Spain, Algeria, Libya, Egypt, Saudi Arabia',
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type: 'eclipse',
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},
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{
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id: 'venus-jupiter-conjunction-2027',
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emoji: '🪐',
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title: 'Venus & Jupiter Conjunction',
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desc: 'Venus and Jupiter appear strikingly close together in the evening sky — a dazzling naked-eye pairing of the two brightest planets.',
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start: '2027-08-23', peak: '2027-08-25',
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color: '#1a2a3a', textColor: '#c8e8ff',
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latHint: null,
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type: 'planetary',
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},
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{
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id: 'orionids-2027',
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emoji: '☄️',
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title: 'Orionid Meteor Shower',
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desc: 'Fast, bright meteors from Halley\'s Comet debris — up to 25/hour. Active Oct 2 – Nov 7.',
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start: '2027-10-02', peak: '2027-10-21',
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color: '#2a1a5a', textColor: '#e8d8ff',
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latHint: null,
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type: 'meteor',
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},
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{
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id: 'leonids-2027',
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emoji: '☄️',
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title: 'Leonid Meteor Shower',
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desc: 'Fast meteors from comet Tempel-Tuttle. Up to 15/hour at peak. Active Nov 6–30.',
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start: '2027-11-06', peak: '2027-11-17',
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color: '#2a1a5a', textColor: '#e8d8ff',
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latHint: null,
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type: 'meteor',
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},
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{
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id: 'geminids-2027',
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emoji: '☄️',
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title: 'Geminid Meteor Shower',
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desc: 'The finest shower of the year — up to 150 meteors/hour, visible even before midnight. Active Dec 4–20.',
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start: '2027-12-04', peak: '2027-12-14',
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color: '#3a1a00', textColor: '#ffe8c0',
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latHint: 'north',
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type: 'meteor',
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},
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{
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id: 'ursids-2027',
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emoji: '☄️',
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title: 'Ursid Meteor Shower',
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desc: 'A quieter shower near the winter solstice — circumpolar, best from northern latitudes. Active Dec 17–26.',
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start: '2027-12-17', peak: '2027-12-22',
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color: '#2a1a5a', textColor: '#e8d8ff',
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latHint: 'north',
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type: 'meteor',
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},
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];
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// Returns a location-aware visibility note for an almanac entry.
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// lat = user's latitude.
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export function getVisibilityNote(entry, lat) {
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if (!entry.latHint) return null;
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if (entry.latHint.startsWith('path:')) {
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return entry.latHint.replace('path:', '').trim();
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}
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if (entry.latHint === 'north') {
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if (lat >= 45) return 'Well placed for your latitude';
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if (lat >= 20) return 'Visible from your location';
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return 'Better from northern latitudes';
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}
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if (entry.latHint === 'south') {
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if (lat <= 10) return 'Well placed for your latitude';
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if (lat <= 40) return 'Visible from your location';
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return 'Better from southern latitudes';
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}
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return null;
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}
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// ─── MAIN ALMANAC EXPORT ─────────────────────────────────────────────────
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// Returns events with peak dates in the next `days` days (default 90),
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// sorted by peak date, with a visibility note added.
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export function getUpcomingEvents(location, days = 90) {
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const today = new Date();
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today.setHours(0, 0, 0, 0);
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const cutoff = new Date(today);
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cutoff.setDate(cutoff.getDate() + days);
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const todayStr = today.toISOString().slice(0, 10);
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const cutoffStr = cutoff.toISOString().slice(0, 10);
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return ALMANAC_CALENDAR
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.filter(ev => ev.peak >= todayStr && ev.peak <= cutoffStr)
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.sort((a, b) => a.peak.localeCompare(b.peak))
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.map(ev => ({
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...ev,
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visibilityNote: getVisibilityNote(ev, location?.lat ?? 51),
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daysUntil: Math.round((new Date(ev.peak + 'T00:00Z') - today) / 86400000),
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}));
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}
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