tonight
Visible planets April 2026: What planets are visible tonight?
Tonight, April 17, the following planets are visible in the night sky: Mercury in April …
Moon phases April 2026: What is the moon phase today?
What is the moon phase today? Today, April 17, 2026, the moon is in the …
Planetary alignment April 2026: All you need to know
Planetary alignment in April 2026 Four planets—Mercury, Mars, Saturn, and Neptune—will align in mid-to-late April …
Astronomy
How do you evaluate a total lunar eclipse?
Danjon Scale of Lunar Eclipse Brightness The French astronomer André-Louis Danjon proposed a useful five-point …
Third quarter moon: All you need to know
A third quarter moon is a primary phase of the lunar cycle that occurs halfway …
First quarter moon: All you need to know
A first quarter moon is a primary phase of the lunar cycle that occurs halfway …