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April 21 - New Moon (12:20 AM PDT)

April 22 - Lyrid Meteor Shower (Best after midnight)

April 24 - Moon and Venus (after sunset) Find the thin waxing crescent Moon next to bright Venus, and above the bright star Aldebaran.

April 29 - First Quarter Moon (2:58 AM PDT)

April 30 - Moon and Mars (evening) Mars and waxing Gibbous Moon close together.

More complete information:
Cabot Sky Calendar
Skymaps.com