January 1991 天文現象
観測地点：Beijing (39.904°, 116.407°)
月間天文現象概要
27 合計天文イベント、含む 4 月相と 4 惑星イベント。
毎日の天文現象
すべての時刻は現地時間 (Asia/Shanghai)
| 日付 | 日の出/日の入り | 月の出/月の入り | 月相 | 天文現象 |
|---|
Planetary outlook
January 1991 mid-month observing conditions
Mercury
Observation tip: Very bright, easily visible to the naked eye; Mercury stays close to the Sun; best seen at dusk or dawn
Venus
Observation tip: Very bright, easily visible to the naked eye; Venus is the brightest planet and is best seen at dusk or dawn
Mars
Observation tip: Very bright, easily visible to the naked eye; Its reddish appearance is obvious; it is best observed near opposition
Jupiter
Observation tip: Very bright, easily visible to the naked eye; Its moons are easy to spot and it is excellent for telescope observing
Saturn
Observation tip: Visible to the naked eye; Saturn’s rings require a telescope to see clearly
Uranus
Observation tip: Binoculars are recommended; Binoculars or a telescope are recommended
Neptune
Observation tip: A telescope is required; A telescope is required; Neptune appears blue-green
Moon
Observation tip: Moon illumination 0.9%; good for observing lunar surface detail
1991 sky events by month
Choose a month to explore the detailed forecast