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1. The vernal equinox

- happens around March 21st

- has days and nights of equal length

2. In the southern hemisphere, the longest day happens during

- June

3. During the winter in the northern hemisphere

- the days are shorter than during summer

1)the vernal equinox happens around March 21st

2)in the southern hemisphere the longest day of the year happens during december

3)The days are shorter then during the summer.

Explanation:

increased stability in the completion of fluorine's outer shell.