Astronomical night - the Sun more than 18° below the horizon - and the moon-free part of it at the sites where remote telescopes are rented: Siding Spring in Australia, the Río Hurtado valley in Chile, Hakos in Namibia, Nerpio in Spain, Mayhill in New Mexico and southern Utah.
Every night is a bar on the timelines of your cities, titled with its moon-free time, so you can plan and book imaging sessions on the other side of the world without converting time zones. Select a night for the moon-free windows, the Moon phase, moonrise and moonset in site time.
In Astronomy. Perfect Clock — a world clock with your calendar across time zones.