After its half-illuminated third quarter phase today, the light will continue to wane until the moon is completely dark on Friday (May 19). This will mark the start of a new 29.5-day lunar cycle ...

When the Sun hits the rims of the Blanchinus, La Caille, and Purbach craters at just the right angles during the Moon's cycle ...

The moon will be half-lit tonight as it reaches its third quarter phase. This phase, also known as the last quarter, marks the halfway point between the full moon and the next new moon which will ...

At this time, the sun shines at such an angle to make it appear as if there is a gigantic 'V' and 'X' marking the barren ...

The moon will be in its third quarter phase on Friday, May 12, with its face half-lit, halfway between its fully illuminated full moon phase and its completely dark new moon phase.

The moon reaches its third-quarter phase on July 9, appearing half-lit in the morning skies before setting shortly after midday.

Eight lunar phases happen in order: new Moon, waxing crescent, first quarter, waxing gibbous, full moon, waning gibbous, third quarter and waning crescent.

First quarter is the third phase of the moon's eight lunar phases. The cycle repeats about every 29.5 days, according to NASA . During the first quarter phase, one half of the moon will appear ...

The third-quarter moon is ahead of Earth in its yearly journey around the sun Earth lags behind the moon by approximately 3.5 hours.

The Moon’s illumination is given at 12 P.M. local time from the same location. For a look ahead at more upcoming sky events, check out our full Sky This Week column. Up Next ...