Unlabeled

The Moon through an average cycle of its phases: how much of its face is lit

New moon to new moon takes 29.53 days on average. In such an average month 46% of the face is lit a week after new moon, and the Moon is full after 14.8 days.

What does this axis measure?
What does this axis measure?
The Moon through an average cycle of its phases: how much of its face is lit: 31 points, a line chart.
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Moon illuminated (%)
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Age of the Moon (days)
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The data: 31 points
Age of the Moon (days)Moon illuminated (%)
00
11.1
24.5
39.8
417
525.7
635.5
745.9
856.5
966.9
1076.4
1184.8
1291.6
1396.5
1499.3
1599.9
1698.3
1794.5
1888.6
1981
2072.1
2162.1
2251.6
2341
2430.8
2521.5
2613.5
277.1
282.6
290.3
29.530590
Source
Computed: lit fraction (1 + cos i) / 2 (Meeus, Astronomical Algorithms) through a mean synodic month of 29.53059 days (NASA GSFC, Eclipses and the Moon's Orbit)
Licence
Original computation by Unlabeled; nothing copied from the source
Read
2026-10-03
Drawn
31 points as the puzzle showed them · line
  • Ran in puzzle #8 on October 4, 2026. Play it