Glossary |
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updated: 2021-07-103 |
The term seeing in astronomy refers to effect of turbulence, mist, clouds, thermal disturbance etc. on the linear light transmission through earth's atmosphere from distant light sources like stars, planets and alike to your telescope.
The seeing index is typically measured in arcseconds .
A seeing disk smaller than 0.4 arcseconds or a Fried parameter larger than 30 centimeters can be considered excellent seeing. The best conditions are typically found at high-altitude observatories on small islands such as Mauna Kea or La Palma (see also: Link to my Homepage).
A seeing index below 1" can be already considered as good, in our rural areas values between 1" and 2" are acceptable (and most likely the best you can expect!). conditions be For more information about astronomical seeing go to Wikipedia.
Check out Meteoblue to get a reliable seeing index forecast.
References:
> https://de.wikipedia.org/wiki/Seeing
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