Spherical astronomy

This year, astronomical autumn will begin on Sunday, September 22, at 15:43 Bulgarian time. At that moment, the Sun will cross the celestial equator during the autumnal equinox, which occurs in the constellation Virgo.

Since 2024 is a leap year, the start of autumn comes about 18 hours earlier than last year, when the season began on September 23 at 09:50.

Today, as the world turns, it heralds the arrival of spring in the Northern Hemisphere. The vernal equinox, an astronomical event signaling the onset of this vibrant season, graces our calendars once again. According to a report by BTA, this celestial occurrence aligns the Earth's axis and orbit in such a way that both hemispheres bask in equal sunlight.

At 05:49 am, the astronomical spring began in Bulgaria.

The sun, in its apparent movement in the ecliptic, crosses the spring equatorial point, and from the southern hemisphere passes into the north. This is also one of the two days of the year where the day and night are approximately equal in duration.

On Friday, at 18:54, the astronomical summer will take place. The Summer Solstice marks the beginning of summer in the Northern Hemisphere around June 21 and around 22 December for the Southern Hemisphere.

At 18.15 today the astronomical spring arrives.

The sun, in its visible movement in the ecliptic, crosses the spring equatorial point, and from the southern hemisphere passes into the north. This is also one of the two days of the year in which day and night are approximately equal in duration.

Astronomical autumn (fall) is arriving in Bulgaria Sunday, September 22 at 11:44 pm, the Institute for Astronomy and the National Astronomical Lab on peak Rozhen at the Bulgarian Academy of Sciences, BAS, announced.

Spring in the form of the vernal equinox is scheduled to start in the Northern Hemisphere on Monday at 12:28 p.m, said the Chief assistant Vladimir Bozhilov from the Physics Faculty of Sofia University ,,St. Kliment Ohridski'', announced from BNR.