Assertion: moon's longitude | /r/AtLocation | angle
Facets:
value: to the sun
type: LOCATION
Source sentences:
text: There are four principal lunar phases: new moon, first quarter, full moon, and last quarter (also known as third quarter), when the Moon's ecliptic longitude is at an angle to the Sun (as viewed from Earth) of 0°, 90°, 180°, and 270°, respectively.[a]