The date of the end of winter and the beginning of spring 2025 astronomically

Arab Weather - Dr. Ammar Al-Sakaji, head of the Jordanian Astronomical Society, said that the moment of the vernal equinox or the beginning of " spring astronomically" occurs at 12 noon on Thursday, March 20 of this year according to Jordan time, and on this day the moment of the vernal equinox also occurs in the northern part of the globe, while at the same moment the autumnal equinox occurs in the southern part of the globe, for this reason the moment of the equinox is considered a cosmic moment, and the spring season continues astronomically in Jordan for 92 days, 17 hours and 40 minutes, and continues until the moment of the summer solstice or the beginning of summer astronomically on June 21.

14 day weather and temperature in Amman, Jordan

At the moment of the vernal equinox, the Earth's axis of rotation neither approaches nor moves away from the sun, i.e. it is perpendicular to the sun, which leads to the length of night and day being "almost" equal in all latitudes, except for the regions of the Earth's equator and the poles, and solar radiation is distributed almost equally between the two hemispheres of the Earth, and at this moment the sun crosses the celestial equator in its orbit from south to north, and this point is historically called the "point of Aries" (which is one of the points of intersection of the zodiac circle with the celestial equator), but this year the moment of the vernal equinox occurs when the sun is in the sign of Pisces.

At the moment of the vernal equinox, a person standing on the Earth's equator can observe the sun directly above him in its apparent path towards the north. The shadows of objects disappear at noon in areas close to the equator, and the sun rises from the "geographic east" and sets from the "geographic west." This is a way to accurately determine east and west.

Mother's Day is the day of the spring equinox.

The vernal equinox and the Aries point are important in celestial systems and coordinates, as well as in space navigation systems and satellite references. This moment is important in astronomy as it is the zero point in "sidereal time" where the values of both the "right ascension angle" and the "celestial longitude" angle are equal to zero. It is related to many calendars and occasions in different cultures, as "Mother's Day" is the vernal equinox day in Jordan and some countries of the world.

The moment of the vernal equinox changes from year to year, as the main reason is the "precession" of the Earth's axis of rotation, in addition to some secondary reasons for slight changes in the tilt of the Earth's axis, precession, or pole movement. According to astronomical calculations in Jordan, this moment will remain on March 20 until the year 2059, when a change occurs on the day after this date.

The reason for the unequal hours of day and night on the vernal equinox is due to the "physics of the atmosphere" of dispersion and refraction, and the distance from the equator, in addition to the height of the site above sea level, and that the sun's disk is a body with dimensions and not a geometric point (the average apparent diameter of the sun's disk is about half a degree of arc or 30 minutes of arc), and the refraction of sunlight in the atmosphere advances the time of sunrise and delays the time of its apparent sunset, which increases the length of the day, but if we want to calculate the day of equal night and day in Jordan accurately, it would be about four and a third days before this date, meaning that the day of equal night and day (balance day) in Jordan is Sunday, March 16, 2025, while areas close to the equator, the length of night and day is almost equal on most days of the year, but if we move to the higher latitudes, for example, in the city of Longyearbyen in Norway, the number of night and day hours is equal on March 17, 2025, and after the vernal equinox , the daylight hours begin to increase until they reach the longest day at the solstice Summer.

The reason for the occurrence of the four seasons is the Earth’s rotation around the sun on an inclined axis, and the degree of inclination is 23.5 degrees. The approach or departure of the inclination of the axis from is the reason for the occurrence of the four seasons astronomically.