Question 1

What phase is the Moon in New York on September 9, 2023?

Accepted Answer

The Moon is Waning Crescent, 17% illuminated, on lunar day 25. It rises at 01:50 and sets at 17:33.

Question 2

What does 17% 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 9, 2023?

Accepted Answer

The Moon is above the horizon for about 15h 43m, from 01:50 to 17:33, reaching at 75° 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 9, 2023

Waning Crescent

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