The words of light. Each defined once.

The light

Golden hourwarm, low sun Blue hourthe deep blue after sunset Afterglowcolour after the sun has gone Alpenglowpink peaks after sunset The Belt of Venuspink over the Earth's shadow The sunset calllittle, some, good, exceptional

The twilights

Civil twilightsun 0° to 6° below Nautical twilightsun 6° to 12° below Astronomical twilightsun 12° to 18° below

The day

Dawnthe light before sunrise Duskthe light after sunset Sunrisethe upper edge appears Sunsetthe upper edge goes Solar noonthe sun at its highest Day lengthsunrise to sunset First lightcivil dawn Last lightcivil dusk

The sun's geometry

Solar altitudethe sun's height, in degrees Azimuththe sun's compass bearing The sun's paththe day's arc across the sky Shadow lengthheight over the tangent The equinoxday and night nearly equal The solsticethe longest and shortest days The 37° linewhere the sunny side switches

The moon

Full moonopposite the sun, all night New moonbetween us and the sun The phase of the moonhow much of the face is lit Moonrise and moonsetabout fifty minutes later each day Supermoona full moon at its nearest Blue moonthe second full moon in a month