The moon will cross in front of the Sun for around four hours on Saturday, creating a partial solar eclipse that careful skygazers will able to see in parts of the Northern Hemisphere.

During a partial solar eclipse, the moon passes between the sun and Earth. The moon casts a shadow on Earth and only partly blocks the sun, making it appear like a crescent. Unlike a total solar eclipse, there’s no totality so experts say proper eye protection must be worn the whole time.