This was
your sky.
Video: Flash on Jupiter
A few days ago, several groups noticed a two-second burst of light on Jupiter. Such flashes have been seen before, with the most famous being a series of impacts in 1994 from Comet Shoemaker-Levy 9. Since then, at least seven impacts have been recorded on Jupiter, usually by amateur astronomers. The featured video shows variations in the flash's brightness.
We cannot put this date's photograph on paper at poster size. We can print the nearest public archive plate to your date instead.
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In tropical astrology, 17 SEP 2021 falls under Virgo (♍). The sign's window runs from 08-23 through 09-22. Virgo is the largest zodiac constellation, holding the heart of the Virgo galaxy cluster. The Sun was crossing this region of the sky on 17 SEP 2021.