Question 1

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

Accepted Answer

The Moon is New Moon, 1% illuminated, on lunar day 1. It rises at 07:28 and sets at 19:06.

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 September 21, 2025?

Accepted Answer

The Moon is above the horizon for about 11h 38m, from 07:28 to 19:06, reaching at 44° 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 September 21, 2025

New Moon

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