Solar cycle

Vernal Equinox Start of Spring	Summer Solstice Start of Summer	Autumnal Equinox Start of Fall	Winter Solstice Start of Winter
20/03/2025 10:01 20 March 2025 09:01 GMT	21/06/2025 04:42 21 June 2025 02:42 GMT	22/09/2025 20:19 22 September 2025 18:19 GMT	21/12/2025 16:03 21 December 2025 15:03 GMT

• The noon is technically when the Sun is at the zenith.
• The morning civil twilight occurs when the Sun is 6 degrees below the horizon and ends at dawn.
• The evening civil twilight starts at sunset and ends when the Sun reaches 6 degrees below the horizon.
• The nautical twilight occurs when the Sun is between 6 degrees and 12 degrees below the horizon.
• The astronomical twilight occurs when the Sun is between 12 degrees and 18 degrees below the horizon.