Light Calendar 2030/31 •

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The year 2030/31 runs from 04.02.2030 to 03.02.2031 and has the following astro­nomical fixed points: 16th New March (VE), 16th New June (SS), 16th New Septe (AE), 16th New Dece (WS) – explanation below, V1.2.4

< 2029/30 | 2030/31 | 2031/32 >

< 2029/30 | 2030/31 | 2031/32 >

Explanation:
The Light Calendar divides the year into 4 almost equal quarters, each centered exactly midway between the astronomical fixed points (winter solstice, vernal equinox, summer solstice, autumnal equinox). This creates 4 seasons with distinct character: Early Spring (days rapidly get brighter each day/ΝFeb-ΝApr, warmth arrives delayed), Early Summer (time of long days/ΝMay-ΝJul), Early Autumn (days rapidly get shorter each day/ΝAug-ΝOct), Early Winter (dark season with little daylight change/ΝNov-ΝJan).

Every year begins with 1st New Febr (start of Early Spring). The leap month is New Jan; in leap years it has one extra day (marked ¹). Leap years are shifted ca. two years compared to the Gregorian calendar. For practical reasons the year number still changes on 1st Jan as usual. The lunations of a light year are numbered 1-13 (similar to week numbers). A lunation belongs to a light year if its full moon occurs within that year. The cycle begins with the astronomical new moon: if this occurs before 12:00, the previous day/night counts as the beginning; after 12:00, the same day counts as the beginning.

This PHP version does NOT compute full astronomical precision (unlike the app), but provides a good approximation of all dates, seasons, and moon cycles. All times shown in Central European Time (UTC+1|2).

Lunations of light year 2030/31:
1. Moon – new: Sat, 02.02.30, full: Sun, 17.02.30
2. Moon – new: Sun, 03.03.30, full: Tue, 19.03.30
3. Moon – new: Tue, 02.04.30, full: Wed, 17.04.30
4. Moon – new: Thu, 02.05.30, full: Thu, 16.05.30
5. Moon – new: Fri, 31.05.30, full: Sat, 15.06.30
6. Moon – new: Sun, 30.06.30, full: Sun, 14.07.30
7. Moon – new: Mon, 29.07.30, full: Mon, 12.08.30
8. Moon – new: Wed, 28.08.30, full: Wed, 11.09.30
9. Moon – new: Thu, 26.09.30, full: Thu, 10.10.30
10. Moon – new: Sat, 26.10.30, full: Sat, 09.11.30
11. Moon – new: Sun, 24.11.30, full: Mon, 09.12.30
12. Moon – new: Tue, 24.12.30, full: Wed, 08.01.31
13. Moon – new: Wed, 22.01.31, full: Fri, 07.02.31

The moon display (see above) works as follows: Μx·y(p/z) = x. Moon, y. Day, p=full moon day, z=cycle length.

In the same vein is 'Gordon's Sun Clock', a single-hand clock whose dial changes daily with the seasons. It is available as a free Android app:

Gordon’s Sun Clock >
Info about Light Calendar (Github) >

For more precise calculations, please check the Android app or the web app.