Astronomical autumn 🍂 🌏 🌟 🌞 🌌
Right on cue it Feels like winter but no worries we’ll have an #indiansummer this weekend !
3.15 am this morning Australian eastern daylight savings time (11+ UTC) was the #AutumnalEquinox and that means daylight savings is almost over (😢) Many cultures around the world celebrate the whole day as the March equinox. However, in reality, the equinoxes occurs at a specific moment in time when the Sun crosses the celestial equator, the imaginary line in the sky above Earth’s Equator, from south to north.
At that moment, Earth's axis is tilted neither away from nor towards the Sun, but is rather perpendicular to the Sun's rays, like the illustration shows ( ☀️ shines directly on the equator) and the length of day and night is nearly equal – but not quite.
Earth doesn’t orbit the Sun upright, but is instead tilted on its axis by roughly 23.5degrees, and our orbit is NOT completely circular, so Earth’s northern and southern hemispheres ‘trade’ places in receiving the sun’s light and warmth most directly, as Earth 🌏 revolves around the sun. We have an equinox twice a year – spring and fall – when the tilt of the Earth’s axis and Earth’s orbit around the sun combine in such a way that the axis is inclined neither away from nor toward the sun.
Simplified : day and night is the Earth spinning , seasons are the orbit around the sun in year (a full revolution around the sun 🌞 ) and tides are combination of the pull of the moon and complex combination of other forces!
The name equinox is derived from the Latin words aequus, meaning equal, and nox, meaning night. In reality though, most places on Earth get to see more daylight than night time on the equinoxes. This is because of two reasons: how sunrise and sunset is defined and atmospheric refraction of sunlight.
On the count down to the Spring Equinox September!