It’s officially Autumn! From the autumnal equinox until the start of winter—the winter solstice in December—days will get shorter, and the noon elevation of the Sun will decrease. This happens because the Earth’s axis is tilted 231⁄2 degrees to its orbit. Day and night are of equal length on September 22. Happy Fall! #GriffithObservatory #lookup #observeandponder #autumn #autumnalequinox