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This means that the days are getting longer again in the northern hemisphere. Theoretically, starting Wednesday, there will be 12 hours between sunrise and sunset around the world. But the actual duration depends largely on topography. Mountains, houses or trees can shorten the day.
On the other hand, if the horizon is completely flat, the day at the beginning of spring already lasts more than twelve hours. On the one hand, this can be explained by perception. Visually, the sun is not a point, but a disk. On the other hand, the atmosphere deflects the sun’s rays towards the earth’s surface.
A day longer than twelve hours
The beginning of spring is a matter of perspective: for astronomers, spring (usually) begins on March 20, while for meteorologists, it’s been spring since March 1. Not only is this different every year, but it also varies by location, according to biologists.
The midnight sun can be seen at both the South and North Pole these days. Only half of the sun is visible at both poles. The midnight sun shines on the North Pole for six months, from Friday until the astronomical start of autumn. But over the South Pole the polar night continues for almost six months. Accordingly, the sun does not shine there until the beginning of autumn.
Why doesn’t spring start on March 21?
Astronomically speaking, spring begins with the equinox of day and night; just at the time when the sun is vertically above the equator. This year, the astronomical start of spring is on March 20 at 4:06 am.
In the Central European time zone, the astronomical start of spring usually falls on March 20. But it wasn’t always that way, and it won’t always be that way. The time depends, among other things, on the distance from the last leap year and on the time zone. The astronomical start of spring may be March 19 or 21 instead of March 20.
Until 1916, spring always began on March 21. Since the 1980s, March 21st occurred only every four years. The astronomical start of spring last occurred on March 21 in 2011; Next time, that won’t be the case until 2102. Because in 2100, due to a special leap year rule, the leap year will be skipped and the astronomical start of spring will be shifted to March 21 in the calendar. Until then, spring will begin to increase on March 19th. Next time is in 2048.
Biologists have not shown as much pragmatism as the WMO in defining seasons. They define these according to the developmental stage of plants, called phenology. There are ten seasons in the phenological calendar that are not tied to fixed dates. The beginning of a new season is marked by the flowers, ripening of fruits or leaf color of some plant species. So it depends on location and altitude as well as weather.
The phenological calendar has three phases for spring: early spring, early spring, and full spring. The first begins when snowdrops, crocuses and primroses bloom. The following spring is characterized by the blooming of violets, tree anemones and forsythia. All of spring is characterized by the blooming of apple trees and lilacs and ends with the blooming of raspberries.
Spring lasts three months
Astronomical spring lasts exactly three months. It ends on June 20. In this case, the Sun appears at the highest north point in its orbit, that is, at 23 degrees 26 minutes 04 seconds north. This makes June 20 the longest day in the entire northern hemisphere.
What will the weather be like in spring?
The weather is still gray and wet, but it’s going to be really nice this week. On Wednesday, in line with the beginning of spring, Switzerland can look forward to particularly warm weather: The thermometer will rise to 20 degrees. The reason for this: warm air coming from Africa and Spain.
But first we have to endure: Monday will be quite dreary, rainy and heavily cloudy. Then the sky clears and the sun warms us. With fog still on the plains on Tuesday morning, it’s important to keep your head down! The sun needs some time to warm up. (SDA)
Source : Blick
I am Dawid Malan, a news reporter for 24 Instant News. I specialize in celebrity and entertainment news, writing stories that capture the attention of readers from all walks of life. My work has been featured in some of the world’s leading publications and I am passionate about delivering quality content to my readers.
