This was
your sky.
Rainbow Airglow over the Azores
The sky over the Azores glows like a repeating rainbow due to airglow. Airglow happens all the time, but it's usually faint. A disturbance, like an approaching storm, can create ripples in Earth's atmosphere called gravity waves. These waves make the airglow structure visible, especially in long-exposure photographs taken along the vertical walls of the airglow.
We cannot put this date's photograph on paper at poster size. We can print the nearest public archive plate to your date instead.
See print sizesFrom $29.00
In tropical astrology, 18 APR 2021 falls under Aries (♈). The sign's window runs from 03-21 through 04-19. Aries is the constellation traditionally tied to spring's arrival in the northern hemisphere. The Sun was crossing this region of the sky on 18 APR 2021.