Time Date Moon Phase Calculator

Shifts the reported local dates of the new and full moons. A fixed offset only - no daylight-saving rule is applied.
Phase
Full Moon
Moon Phase Calculator
Illuminated fraction of the disc
99.76 %
Sun-Moon elongation
177.2341 deg
Elongation from new moon (-180 to 180)
177.2341 deg
Age since the last new moon
14.001 days
Waxing or waning
waxing
Previous new moon (UT)
2024-01-11
Previous new moon time (UT)
11:58 UT
Next new moon (UT)
2024-02-09
Next new moon time (UT)
23:00 UT
Next full moon (UT)
2024-01-25
Next full moon time (UT)
17:55 UT
Days to the next full moon
0.247 days
Length of this lunation
29.4596 days
Next full moon, your local date
2024-01-25
Summary
2024-01-25 720 UT: Full Moon, 99.8% illuminated, 14 days old.
Worked out from Jean Meeus, Astronomical Algorithms, 2nd edition, chapters 25 (solar coordinates), 47 (position of the Moon) and 48 (illuminated fraction) and 2 other sources.
For entertainment and cultural interest. Astrology and numerology are traditional practices with no scientific basis for predicting events or describing a person; do not use them for health, financial or legal decisions.

How this is worked out

5 steps
  1. Julian Day for 2024-01-25 12 h UT is 2460335.
  2. Apparent elongation of the Moon from the Sun: 177.2341 degrees (0 = new, 180 = full), so the Moon is waxing.
  3. Illuminated fraction = (1 + cos(phase angle)) / 2 = 99.763%.
  4. Previous new moon 2024-01-11 11:58 UT, so the Moon is 14.001 days old; the next new moon is 2024-02-09 23:00 UT, making this lunation 29.4596 days rather than the 29.5306-day average.
  5. Next full moon: 2024-01-25 17:55 UT.

Results are general information, not financial, tax, legal, medical or engineering advice.