Question 1

What phase is the Moon in New York on September 16, 2023?

Accepted Answer

The Moon is First Quarter, 50% illuminated, on lunar day 3. It rises at 09:01 and sets at 20:13.

Question 2

What does 50% 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 16, 2023?

Accepted Answer

The Moon is above the horizon for about 11h 12m, from 09:01 to 20:13, reaching at 40° 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 16, 2023

First Quarter

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