Question 1

What phase is the Moon in New York on September 18, 2023?

Accepted Answer

The Moon is First Quarter, 19% illuminated, on lunar day 5. It rises at 11:11 and sets at 21:03.

Question 2

What does 19% 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 18, 2023?

Accepted Answer

The Moon is above the horizon for about 9h 52m, from 11:11 to 21:03, reaching at 29° 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 18, 2023

First Quarter

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