Light Calendar 2027/28 •

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The year 2027/28 runs from 04.02.2027 to 03.02.2028 and has the following astro­nomical fixed points: 16th New March (VE), 16th New June (SS), 17th New Septe (AE), 17th New Dece (WS) – explanation below, V1.2.4

< 2026/27 | 2027/28 | 2028/29 >

< 2026/27 | 2027/28 | 2028/29 >

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 2027/28:
0. Moon – new: Thu, 07.01.27, full: Fri, 22.01.27
1. Moon – new: Sat, 06.02.27, full: Sat, 20.02.27
2. Moon – new: Sun, 07.03.27, full: Sun, 21.03.27
3. Moon – new: Tue, 06.04.27, full: Tue, 20.04.27
4. Moon – new: Wed, 05.05.27, full: Wed, 19.05.27
5. Moon – new: Fri, 04.06.27, full: Fri, 18.06.27
6. Moon – new: Sat, 03.07.27, full: Sun, 18.07.27
7. Moon – new: Sun, 01.08.27, full: Mon, 16.08.27
8. Moon – new: Tue, 31.08.27, full: Wed, 15.09.27
9. Moon – new: Wed, 29.09.27, full: Fri, 15.10.27
10. Moon – new: Fri, 29.10.27, full: Sat, 13.11.27
11. Moon – new: Sat, 27.11.27, full: Mon, 13.12.27
12. Moon – new: Mon, 27.12.27, full: Tue, 11.01.28
13. Moon – new: Wed, 26.01.28, full: Thu, 10.02.28

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.