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Moon phase
21 January 2019 is Full, and the lit part is 100.
Why this exists
This page names the phase of a Gregorian date. 2019, 1, 21 is Full and the lit part is 100. The sketch lights the right side while the moon is waxing, which is the northern view.
The animal page places a date in the Chinese year. This page only names the phase.
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01How to use it
Enter a year, a month, and a day, and the name and the lit percent appear.
The disc is a sketch of the eight phases.
Copy puts the phase name, such as Full, on the clipboard.
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02What you get
2019, 1, 21 is Full 100.
2019, 1, 14 is First quarter 52.
2026, 2, 17 is New 0.
Entered2019 · 1 · 21
2019 · 1 · 21 Full 100 2019 · 1 · 14 First quarter 52 2026 · 2 · 17 New 0 2019 · 2 · 29 stops -
03Worth knowing
The page does not announce an eclipse.
Closing the tab clears the date.
Nothing is sent to a server.
Questions
- QWhat is 21 January 2019?
- AFull, and the lit part is 100.
- QIs a quarter always 50?
- ANo. 2019, 1, 14 is 52.
- QIs this a lunar calendar?
- ANo. It is the phase of a Gregorian date.
- QWhat about 29 February 2019?
- A2019 is not a leap year, so the page stops.
How this page works it out
This page names the phase of a Gregorian date with one of eight names and a lit percent. 2019, 1, 21 is Full and the lit part is 100. 2019, 1, 14 is First quarter and the lit part is 52. 2026, 2, 17 is New and the lit part is 0, and that date is Chinese New Year in 2026.
Each name covers about 3.7 days. The number is the lit fraction at 00:00 UTC on that civil date, so a quarter is not forced to 50. The disc is drawn as the moon looks from the northern half of the earth. A waxing moon is bright on the right, and the bright side is the other way from the southern half. The page does not announce an eclipse.
It does not convert the date into a lunar calendar. The animal page places a date in the Chinese year. Years run from 1900 to 2100, and 2019 is not a leap year, so 29 February stops. The figure stays in this browser, and closing the tab clears the date. Nothing is sent to a server.