Question 1

What phase is the Moon in New York on August 21, 2025?

Accepted Answer

The Moon is New Moon, 1% illuminated, on lunar day 28. It rises at 05:18 and sets at 19:39.

Question 2

What does 1% illumination mean?

Accepted Answer

The share of the Moon's visible disc that is lit by the Sun. 0% is new moon and 100% is full moon. Illumination changes fastest near the quarters and slowest near new and full moon.

Question 3

When can the Moon be seen on August 21, 2025?

Accepted Answer

The Moon is above the horizon for about 14h 20m, from 05:18 to 19:39, reaching at 65° at culmination.

Question 4

How accurate is this moon data?

Accepted Answer

Phase, illumination and moon events are computed from astronomical ephemerides for the city's coordinates and timezone. Moonrise and moonset also depend on the local horizon and elevation.

Moon phase for August 21, 2025

New Moon

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