Recent SemestersFall 2026, Spring 2026, Fall 2025, Spring 2025Class Size35 studentsCredits1PrerequisiteSuccessful completion of Elementary Algebra or equivalent, or placement by other measures as applicable and completion of or concurrent enrollment in ASTR 100, ASTR 115 or ASTR 125 Transfers ToUC and CSUCal-GETC Area 5C · IGETC Area 5C · IGETC Area 5A · CSU GE Area B3DescriptionOffered as an alternative to Astronomy 101. Students observe the moon, planets, and various star clusters, using CSM observatory 's telescopes. They will have the opportunity to image planets and observe stellar spectra, using the department's CCD cameras and Rainbow Optics eyepiece spectroscope. Use of the department's planetarium projector assists students in becoming familiar with the sky. Focus is on observational techniques. Extra supplies may be required.Usually HeldTue 7:10pm–10:00pm 