Example of an Astral crown
The Astral Crown is a gold crown surmounted with eight low points. The centrals and laterals points are topped with a star, with an unspecified number of points, between two wings.
In heraldry an astral crown is mounted atop the shields of coats of arms of units belonging to some air forces or the personal arms of its distinguished commanders.
After the formation of the Royal Air Force its creation became necessary because it was not an Roman military award equivalent for Aerial warfare such as the Naval crown for navies and the Camp crown for armies.
An astral crown in the emblem of the 1227 (Sidcup) ATC Squadron (RAF)
Emblem of the 2070 (Glenfield) ATC Squadron (RAF)