Amateur and professional astronomers alike will be treated to a pair of celestial events today. A penumbral lunar eclipse will be accompanied by the closest the comet 45P will be to the earth in its galactic travels. Not to be confused with a solar eclipse where the moon blocks out the sun, a lunar eclipse occurs when the Earth blocks the sun from the moon. The moon will be full as it passes through the outer part of Earth’s shadow, also known as the penumbra, which blocks part of the sun’s rays from reaching the moon. This phenomenon makes the moon appear darker than usual. According to NASA, people can expect to see the eclipse around 6:43 p.m. Friday.

To view the second phenomenon, people might have to stay up later than usual. Comet 45P has been visible after sunset for the past two months through telescopes. At around 3 a.m. Saturday, it will make its closest approach to Earth, approximately 7.4 million miles away, and should be visible through binoculars. The comet can be found in the eastern sky near the constellation Hercules. It will have a bright blue-green “head” with a tail, and will appear to be traveling toward the horizon. Comet 45P will remain visible in various points of the night sky until the end of February, according to NASA, though after Saturday it will be difficult to see without a telescope.