This Week’s Sky: June 14 to 20, 2021 | Summer solstice | SkyNews

Thursday, June 17 – First quarter Moon (at 03:54 GMT)

A diagram of the first quarter Moon on June 17, 2021. | SkyNews
First quarter Moon on June 17, 2021 (Chris Vaughan, Starry Night time Schooling)

When the Moon completes the primary quarter of its orbit round Earth at 11:54 p.m. EDT on Thursday, June 17 (or 3:54 GMT on June 18) its 90-degree angle away from the Solar will trigger us to see it half-illuminated on its jap aspect. At first quarter, the Moon all the time rises round midday and units round midnight, so it is usually seen within the afternoon daytime sky. The evenings surrounding first quarter are the most effective ones for seeing the lunar terrain when it’s dramatically lit by low-angled daylight.

Sunday, June 20 – June solstice (at 03:32 GMT on June 21)

A diagram of the Sun at June solstice on June 20, 2021. | SkyNews
June solstice on June 20, 2021 (Chris Vaughan, Starry Night time Schooling)

On Sunday, June 20 at 11:32 p.m. EDT (or 03:32 GMT on Monday, June 21), the Solar will attain its northernmost declination for the yr, ensuing within the longest daytime of the yr for the Northern Hemisphere and the shortest daytime of the yr for the Southern Hemisphere. The solstice marks the start of the summer time season within the Northern Hemisphere, and winter within the Southern Hemisphere.

Monday, June 21 – Jupiter reverses course (wee hours)

A diagram of Jupiter reversing direction on June 21, 2021. | Starry Night Education
Jupiter reversing course on June 21, 2021 (Chris Vaughan, Starry Night time Schooling)

In the course of the early morning hours of Monday, June 21, Jupiter will pause in its common eastward movement in entrance of the distant of western Aquarius after which start a retrograde loop (purple curve with dates) that can final till mid-October. The obvious reversal in Jupiter’s movement is an impact of parallax produced when Earth, on a quicker orbit, begins to go Jupiter on the “inside monitor”. Beginning this week, Jupiter will rise earlier than midnight native time, and its 19-degree angular separation from Saturn will slowly lower.

Chris Vaughan is a science author, geophysicist, astronomer, planetary and an “outreach RASCal.” He writes Astronomy Skylights, and you’ll him on Twitter at @astrogeoguy. He may also carry his Digital Starlab transportable planetarium to your college or different daytime or night occasion. Contact him by means of to tour the universe collectively.

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