After the Perseids have just come to an end, the next astronomical highlight awaits us in September: the total lunar eclipse and the blood moon. On 07.09.2025 you can witness the spectacle on a clear day. So keep the evening free, or make an appointment to experience the event together. Because the next total lunar eclipse that will be visible in Vienna will not be until 31.12.2028.
Total lunar eclipse: How does a blood moon occur?
A total lunar eclipse occurs when the full moon enters the Earth’s umbra. This happens as soon as the sun, earth and moon are in line. The earth moves between the sun and the moon, casting its shadow on the moon and darkening it. During the course of the eclipse, you can observe how the moon first enters the penumbra and then slowly becomes a crescent as it enters the umbra until it is finally completely eclipsed.
However, the moon is not completely eclipsed, but its light is attenuated. It then shines about 10,000 times weaker than usual, so that the stars around the moon can be seen, which it normally outshines. The long-wave red scattered light from the Earth’s atmosphere gives it a red color. This is where the name “blood moon” comes from, which, unlike the strawberry moon, is actually derived from the color.
The total lunar eclipse in Vienna
To observe the lunar eclipse in Vienna, you should look for a place with a clear view to the east. You should take up position from 19:20, when the moon rises. The eclipse will reach maximum totality at 20:11. The moon then gradually emerges from the Earth’s shadow and the total lunar eclipse finally ends at 20:52.
You can witness the event at the Kuffner Observatory, which will exceptionally open its doors earlier than usual for you. Normally, the observatory is open on Sundays from 7 pm.