At Home in the USA, it was the start of Spring.
In Australia, where I was on this day, it was the start of Fall.

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Meteorologists recognize March 1 as the first day of Meteorological Spring or Fall, which is based on annual temperature cycles and the Gregorian calendar. In the Northern Hemisphere, this is the first day of Meteorologist Spring. In the Southern Hemisphere, it is the first day of Meteorologist Fall.

Earth has seasons because our planet’s axis of rotation is tilted at an angle of 23.5 degrees relative to our orbital plane, that is, the plane of Earth’s orbit around the sun. When the Northern Hemisphere is oriented toward the sun, that region of Earth warms because of the corresponding increase in solar radiation. The sun’s rays are striking that part of Earth at a more direct angle. It’s Spring/Summer.

When the Northern Hemisphere is oriented toward the sun, the sun’s rays are more direct. Hence, that part of Earth warms. Seasons in the Southern Hemisphere occur at opposite times of the year from those in the Northern Hemisphere. Northern Spring/Summer = Southern Fall/Winter.