On Friday 27th of January, 2018, I gave a presentation at the KW RASC on Al-Sufi's Book Of Fixed Stars.

The book is the first illustrated pictorial star atlas, and was very influential for centuries after it was authored. It spread widely from central Asia, throughout the Middle East, and to Europe. It was translated into many languages.

Here is the presentation slides, and audio recording:

If you use a telescope for astronomical observation or astrophotography, or a camera for night scenes, such as the aurorae, star trails, and the like, you must have experienced dew building up within an hour or less.

Using a planetarium program is a very common thing for any amateur astronomer. I use three such programs, namely: Stellarium, Cartes du Ciel (SkyCharts), and KStars.