Q:- What do you mean by the term Equinox?
-> A period in which days and night are equal..
The term equinox is derived from the Latin word which means 'equal night'. It happens twice a year when the tilt of earth's axis is neither away nor towards the sun. At this time the sun is directly above the Earth's equator.
The vernal equinox (the first point of Aries), is the point at which the sun appears to cross the celestial equator from south to north and it occurs around March 21. It marks the first day of beginning of spring season.
At the autumnal equinox, around September 23, the sun again appears to cross the celestial equator, but this time from north to south. Autumnal equinox marks the first day of the beginning of autumn season.
It will be interesting to know that one effect of equinoctial periods is the temporary disruption of communication (geostationary) satellites. There are a few days near the equinox when the sun goes directly behind the satellite within the beamwidth of Earth's ground station antenna. Sun's powerful broadband microwave noise spectrum overload the Earth station's reception circuits with noise and, depending on antenna size and other factors, temporarily disrupt or degrade the circuit. This degree of interference caused by the satellite and the sun varies from slight signal degradation to complete signal loss as the downlink is completely swamped by the noise signal from sun.
-> A period in which days and night are equal..
The term equinox is derived from the Latin word which means 'equal night'. It happens twice a year when the tilt of earth's axis is neither away nor towards the sun. At this time the sun is directly above the Earth's equator.
The vernal equinox (the first point of Aries), is the point at which the sun appears to cross the celestial equator from south to north and it occurs around March 21. It marks the first day of beginning of spring season.
At the autumnal equinox, around September 23, the sun again appears to cross the celestial equator, but this time from north to south. Autumnal equinox marks the first day of the beginning of autumn season.
It will be interesting to know that one effect of equinoctial periods is the temporary disruption of communication (geostationary) satellites. There are a few days near the equinox when the sun goes directly behind the satellite within the beamwidth of Earth's ground station antenna. Sun's powerful broadband microwave noise spectrum overload the Earth station's reception circuits with noise and, depending on antenna size and other factors, temporarily disrupt or degrade the circuit. This degree of interference caused by the satellite and the sun varies from slight signal degradation to complete signal loss as the downlink is completely swamped by the noise signal from sun.
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