The astrovane is used by wizards to track the cycles of the sun and the moon. When the days are exactly even, the sun and the moon emit a special magic to signal the arrival of the equinox dragon and the harvest festival.
While the Equinox Dragon was available, the Astrovane had an animation: the "Sun" side of the Astrovane gave off the yellow beams of light that were first seen shooting up from the Sun Stones on the day of the Solstice, while the "Moon" side of the Astrovane gave off the white sparkles that were seen on the surface of the Moon Habitat when the Blue Moon Dragon was available. This is also referenced in the Astrovane's description, which states, "emit a special magic to signal the arrival of the equinox dragon and the harvest festival".
The Astrovane is released near the release, and becomes animated during availability, of the Equinox Dragon through the time of the dragons' availability.
On June 20, 2014, the Astrovane did not receive any animation even though it was released along with the Equinox Dragon.