will give us a new "earliest" spring equinox. This occurs twice each year, around 20 March and 23 September. Day length is also affected by the variable orbital speed of the Earth around the Sun.
The 2020 vernal equinox will bring the earliest spring to the US in 124 years Click here for more Space.com videos... Come Thursday (March 19), we will have a …
This drift induced Pope Gregory XIII to establish the modern Gregorian calendar. This in turn raised the possibility that it could fall on 22 March, and thus Easter Day might theoretically commence before the equinox. In the half-year centered on the June solstice, the Sun rises north of east and sets north of west, which means longer days with shorter nights for the northern hemisphere and shorter days with longer nights for the southern hemisphere.
An equinox is commonly regarded as the instant of time when the plane (extended indefinitely in all directions) of Earth's equator passes through the geometric center of the Sun's disk. If you're surprised that spring equinox is not falling on the 20th or 21st, it's for good reason.
 On the date of the equinox, the center of the Sun spends a roughly equal amount of time above and below the horizon at every location on the Earth, so night and day are about the same length. Dinendra Haria/SOPA Images/LightRocket/Getty Images. Because the Julian year is longer than the tropical year by about 11.3 minutes on average (or 1 day in 128 years), the calendar "drifted" with respect to the two equinoxes – so that in 300 AD the spring equinox occurred on about 21 March, and by 1500 AD it had drifted backwards to 11 March. In other words, it is the moment at which the center of the visible Sun is directly above the equator. The upper limb is already up for at least a minute before the center appears, and the upper limb likewise sets later than the center of the solar disk. So we'll all share something else in our social-distancing solitude -- a glorious, near perfect balance of daytime and nighttime all over the world. As a result, they are visible only as a thin line when seen from Earth. In the Northern Hemisphere, the term vernal point is used for the time of this occurrence and for the precise direction in space where the Sun exists at that time. , Astronomical event where the Sun is directly above the Earth's equator, This article is about an astronomical event. The word is derived from the Latin aequinoctium, from aequus (equal) and nox (genitive noctis) (night).
The subsolar point crosses the equator moving northward at the March equinox and southward at the September equinox. Well, that's even more complicated than figuring out which day it is. The bottom line is get used to more 19ths! Its latitude will not be exactly zero, since Earth is not exactly in the plane of the ecliptic.
But for 2021, it will revert to the more usual March 20 -- and we hope a return to the gathering of crowds to marvel at the majesty of the timeless rhythms of nature. , Equinoxes occur on any planet with a tilted rotational axis.
The March Equinox In the Northern Hemisphere, the March equinox (aka spring equinox or vernal equinox) occurs when the Sun crosses the equator line, heading north in the sky. You get that truly equal day/night split a few days before the official spring equinox. , Since the Moon (and to a lesser extent the planets) causes Earth's orbit to slightly vary from a perfect ellipse, the equinox is officially defined by the Sun's more regular ecliptic longitude rather than by its declination. Long before conceiving this equality, primitive equatorial cultures noted the day when the Sun rises due east and sets due west, and indeed this happens on the day closest to the astronomically defined event. (For a given frequency band, a larger antenna has a narrower beam-width and hence experiences shorter duration "Sun outage" windows. In the Northern Hemisphere, it is the first day of spring. Sunrise and sunset can be defined in several ways, but a widespread definition is the time that the top limb of the Sun is level with the horizon. The March equinox marks the moment the Sun crosses the celestial equator – the imaginary line in the sky above the Earth’s equator – from south to north and vice versa in September. It is only after a complete Gregorian leap-year cycle of 400 years that the seasons commence at approximately the same time.
Using the current official IAU constellation boundaries – and taking into account the variable precession speed and the rotation of the celestial equator – the equinoxes shift through the constellations as follows (expressed in astronomical year numbering when the year 0 = 1 BC, −1 = 2 BC, etc. It turns out you actually get a little more daylight than darkness on the equinox, depending where you are on the planet. Also on the day of an equinox, the Sun rises everywhere on Earth (except at the poles) at about 06:00 and sets at about 18:00 (local solar time).
 With this definition, the day is longer than the night at the equinoxes:, In sunrise/sunset tables, the atmospheric refraction is assumed to be 34 arcminutes, and the assumed semidiameter (apparent radius) of the Sun is 16 arcminutes. This is known as the dip of the horizon and varies from 3 arcminutes for a viewer standing on the sea shore to 160 arcminutes for a mountaineer on Everest. Later in this century, Europe, Africa and parts of Asia will eventually see spring equinoxes on March 19. The times of sunset and sunrise vary with the observer's location (longitude and latitude), so the dates when day and night are equal also depend upon the observer's location. For the same reason, this is also the time when the Sun rises for an observer at one of Earth's rotational poles and sets at the other; for a brief period, both North and South Poles are in daylight.[b].  This occurs twice each year, around 20 March and 23 September. (USA, Central America, Canada, Europe, Asia, northern Africa), March Equinox in Brussels, Brussels, Belgium is onSaturday, 20 March 2021, 10:37 CET (Change city), March Equinox in Universal Coordinated Time is onSaturday, 20 March 2021, 09:37 UTC, (Australia, New Zealand, South America, southern Africa), September Equinox in Brussels, Brussels, Belgium is onWednesday, 22 September 2021, 21:21 CEST (Change city), September Equinox in Universal Coordinated Time is onWednesday, 22 September 2021, 19:21 UTC.
St Mary's Lighthouse greets the 2019 spring equinox at Whitley Bay on the northeast coast of England. In the Northern Hemisphere, the Vernal (Spring) Equinox marks the first day of astronomical spring.  Ancient Greek calendars too had the beginning of the year either at the autumnal or vernal equinox and some at solstices. Much of the rest of the world will see its arrival in the early hours of Friday, March 20. ): The equinoxes are sometimes regarded as the start of spring and autumn. The day is a bit longer at higher latitudes than at the equator because it takes the sun longer to rise and set the closer you get to the poles. But on a much brighter note, the sun and Earth continue their eternal business unimpeded by a virus -- and we're getting a little jump on things this year.
The Sun's immense power and broad radiation spectrum overload the Earth station's reception circuits with noise and, depending on antenna size and other factors, temporarily disrupt or degrade the circuit.
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