In the Northern Hemisphere, the March equinox is called the vernal or spring equinox while the September equinox is called the autumnal or fall equinox. The word "solstice" comes from the Latin word "sol" meaning sun, and "sistere" meaning to make stand. Decoding the ancient Greek astronomical calculator known as the Antikythera Mechanism.

In addition, some 'ghost' suns are also indicated below the horizon, up to 18° below it; the Sun in such areas still causes twilight. The March equinox occurs about when the Sun appears to cross the celestial equator northward. Diagram of the Earth's seasons as seen from the south. Because of the precession of the Earth's axis, the position of the vernal point on the celestial sphere changes over time, and the equatorial and the ecliptic coordinate systems change accordingly. Sarasota Herald-Tribune ~ 1777 Main St., Sarasota, FL 34236 ~ Do Not Sell My Personal Information ~ Cookie Policy ~ Do Not Sell My Personal Information ~ Privacy Policy ~ Terms Of Service ~ Your California Privacy Rights / Privacy Policy. A hemisphere’s winter solstice is the shortest day of the year and its summer solstice the year’s longest. The instants of the equinoxes are currently defined to be when the apparent geocentric longitude of the Sun is 0° and 180°.[6].

within the beam-width of the ground-station antenna) for a short period each day. On the planetary scene, Mercury, our solar system’s innermost planet, and Venus, the second planet from the sun, both reached their greatest elongation on March 24. [3][4] This occurs twice each year, around 20 March and 23 September. The word "equinox" actually comes from a Latin term meaning "equal night."

The Pope wanted to continue to conform with the edicts of the Council of Nicaea in 325 AD concerning the date of Easter, which means he wanted to move the vernal equinox to the date on which it fell at that time (21 March is the day allocated to it in the Easter table of the Julian calendar), and to maintain it at around that date in the future, which he achieved by reducing the number of leap years from 100 to 97 every 400 years. To help visualize the seasons, imagine that the Earth’s orbit around the sun is a clock with an elliptical face (all the planets have elliptical orbits). The earliest September equinox will be 21 September 2096 while the latest was 23 September 2003 (Universal Time). The date of the closest approximation of the equilux varies slightly by latitude; in the mid-latitudes, it occurs a few days before the spring equinox and after the fall equinox in each respective hemisphere. The interesting thing is that the source of the shower is debris left by asteroid 2002 FC, which is about the size of the Golden Gate Bridge and takes 4.7 years to orbit the sun. A third correction for the visual observation of a sunrise (or sunset) is the angle between the apparent horizon as seen by an observer and the geometric (or sensible) horizon. Choose the plan that’s right for you.

In 2019, we greeted spring on March 20th with the arrival of the vernal equinox and on December 21st we welcome winter with the arrival of the solstice. The upper culmination of the vernal point is considered the start of the sidereal day for the observer. The same things happen on the fall (autumnal) equinox, which is on Sept. 22 this year. The equinoxes are the only times when the solar terminator (the "edge" between night and day) is perpendicular to the equator. 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).

These events are referred to as Equinoxes.The word equinox is derived from two Latin words - aequus (equal) and nox (night). Systematically observing the sunrise, people discovered that it occurs between two extreme locations at the horizon and eventually noted the midpoint between the two. 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]. That reference time is called the equinox of date.[31]. Later it was realized that this happens on a day when the duration of the day and the night are practically equal and the word "equinox" comes from Latin aequus, meaning "equal", and nox, meaning "night". Saturn's most recent equinox was on 11 August 2009, and its next will take place on 6 May 2025. In the 21st century the earliest March equinox will be 19 March 2096, while the latest was 21 March 2003.

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