December 1990 אירועים שמימיים

Observation tip: Visible to the naked eye; Mercury stays close to the Sun; best seen at dusk or dawn

Observation tip: Very bright, easily visible to the naked eye; Venus is the brightest planet and is best seen at dusk or dawn

Observation tip: Very bright, easily visible to the naked eye; Its reddish appearance is obvious; it is best observed near opposition

Observation tip: Very bright, easily visible to the naked eye; Its moons are easy to spot and it is excellent for telescope observing

Observation tip: Visible to the naked eye; Saturn’s rings require a telescope to see clearly

Observation tip: Binoculars are recommended; Binoculars or a telescope are recommended

Observation tip: A telescope is required; A telescope is required; Neptune appears blue-green

Observation tip: Moon illumination 4.3%; good for observing lunar surface detail