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Another celestial event in a month of good skywatching, the Lyrid meteor showers will be visible this week.

The annual mid-April event occurs when the Earth passes through comet debris. It peaked in the early hours of Tuesday, but meteors will be visible through Friday from all parts of the Northern Hemisphere. NASA experts estimate the count at about 20 an hour.

The best time to look in the Bay Area is in the few hours starting at midnight. The rise of the gibbous moon — just before 3 a.m. Wednesday — will make smaller meteors less visible. As always with astronomical events, dark, clear skies afford the best viewing.

The Lyrids are named for Lyra, the constellation in which they appear to originate.

Northern California skywatchers last week saw a total lunar eclipse as well as a dramatically bright view of the planet Mars.