In more detail
Day length changes most through the year at high latitudes, while near the equator it stays close to 12 hours. Twilight lasts until the Sun is about 6° (civil), 12° (nautical) or 18° (astronomical) below the horizon.
Glossary
Science & Engineering
Sunrise and sunset
Sunrise and sunset are the times the top edge of the Sun crosses the horizon, which depend on date and latitude.
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See also
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Glossary
Moon phase
A moon phase is how much of the Moon's sunlit face is visible from Earth, cycling from new moon to full moon and back about every 29.5 days.
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Glossary
UTC
UTC is the global reference time standard from which all time zones are defined as offsets.