Question 1

What phase is the Moon in New York on September 17, 2023?

Accepted Answer

The Moon is First Quarter, 12% illuminated, on lunar day 4. It rises at 10:05 and sets at 20:36.

Question 2

What does 12% 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 17, 2023?

Accepted Answer

The Moon is above the horizon for about 10h 31m, from 10:05 to 20:36, reaching at 34° 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 17, 2023

First Quarter

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