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When and What Is the September Equinox?

The September Equinox. There are two equinoxes every year ? in September and March ? when the sun shines directly on the equator and the length of day and night is nearly equal. (4 days ago)


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 center of the Sun. This occurs twice each year: around 20 March and 23 September.In other words, it is the moment at which the center of the visible Sun is directly above the Equator. In the northern hemisphere, the equinox in March is called the (5 days ago)

? Fall Equinox

? Fall Equinox. Equinoxes are opposite on either side of the equator, so the autumnal (fall) equinox in the Northern Hemisphere is the spring (vernal) equinox in the Southern Hemisphere and vice versa. (5 days ago)

2019: The First Day of Fall | Facts

What is the ? Autumn days come quickly, like the running of a hound on the moor.?Irish proverb The autumnal equinox?also called the September or fall equinox?is the astronomical start of fall in the Northern Hemisphere and spring in the Southern Hemisphere.. Why is it called an equinox?The word comes from the Latin aequus, meaning ?equal? and nox, meaning ?night.? (1 month ago)


September 23 or 24 is Day, a national holiday. It's a day not just to mark the changing of seasons but also to pay our respects to our deceased parents, grandparents, and other family members. (1 week ago)

: What it means and how you can make the

The (the first day of autumn 2018) occurs on Sunday September 23 this year. The equinox happens when the equator passes the centre of the sun. This is when the north and south (6 months ago)

Earth's Seasons and Apsides

You can obtain the dates of the seasons (equinoxes and solstices) and apsides (perihelion and aphelion) of the orbit of the Earth by typing the year (1700-2100) in the space below and clicking on the "Find dates" button. (2 weeks ago)

Glossary of Terms: A

Atmospheric absorption is defined as a process in which solar radiation is retained by a substance and converted into heat energy.The creation of heat energy also causes the substance to emit its own radiation. (6 days ago)

Boston / Norton, MA

US Dept of Commerce National Oceanic and Atmospheric Administration National Weather Service Boston / Norton, MA 46 Commerce Way Norton, MA 02766 508.622.3250 (3 days ago)

Definition of Autumnal

of or characteristic of or occurring in autumn characteristic of late maturity verging on decline

Definition of Equinox

either of two times of the year when the sun crosses the plane of the earth s equator and day and night are of equal length; astronomy either of the two celestial points at which the celestial equator intersects the ecliptic