When Does Autumn Start 2024 In Mumbai. As devotees of lord shiva observe the first somwar fast, know sawan somwar calendar, muhurat, history, and more. The spring and autumn equinox is an astronomical phenomenon, in which the day is equal to the night, they mark the change of the seasons.

Here are the equinox and solstice dates—plus, answers to common questions. We know that the spring and autumn.