Question 1

What phase is the Moon in New York on October 4, 2023?

Accepted Answer

The Moon is Last Quarter, 59% illuminated, on lunar day 21. It rises at 22:41 and sets at 14:52.

Question 2

What does 59% 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 October 4, 2023?

Accepted Answer

The Moon is above the horizon for about 16h 11m, from 22:41 to 14:52, reaching at 77° 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 October 4, 2023

Last Quarter

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