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Posts Tagged ‘Super Moon’

04/06/2020 – Ephemeris – Tomorrow’s full moon is special in two ways

April 6, 2020 Leave a comment

This is Ephemeris for Monday, April 6th. Today the Sun will be up for 13 hours and 3 minutes, setting at 8:17, and it will rise tomorrow at 7:11. The Moon, 1 day before full, will set at 7:21 tomorrow morning.

The Moon will be full tomorrow, and also it will reach perigee, that is, its closest to the Earth of its current orbit, and for 2020. That makes it a super moon. The orbit of the Moon is affected by the Sun, Venus, and Jupiter mostly. So all perigees are not equally close. At perigee tomorrow the Moon will be 221,772 miles (356,907* km). I its most distant point from the Earth of 252,564 miles (406,462* km). We won’t notice it because it will be nearly new at that time. Tomorrow’s full moon will be special in another way, because it it the full moon that announces Easter for both Christian churches, east and west, and Passover for the Jews. I’ll talk more about that tomorrow.

The event times given are for the Traverse City/Interlochen area of Michigan. They may be different for your location.

* According to Astronomical Tables of the Sun, Moon and Planets Third Edition by Jean Meeus.

03/19/2019 – Ephemeris – Spring and a super-moon happen tomorrow

March 19, 2019 Comments off

Ephemeris for Tuesday, March 19th. Today the Sun will be up for 12 hours and 5 minutes, setting at 7:53, and it will rise tomorrow at 7:46. The Moon, 1 day before full, will set at 7:55 tomorrow morning.

Today and tomorrow are busy days, astronomically speaking, for the Earth, Sun and Moon. This afternoon at 3:47 the Moon will reach the perigee point in its orbit of the Earth, its closest point of 223,200 miles (359,400 km) center to center. With the full moon just 30 hours later this will make the Moon a super-moon, the third in a row. The Moon will be full enough to call tonight’s moon a super-moon too when it rises around 6:16 p.m. The next event will be the coming of spring, when the Sun appears to cross the celestial equator heading northward. For a point in the Pacific Ocean, on the equator the Sun will be directly overhead at 5:58 p.m. our time or 21 hours, 58 minutes Universal Time or Greenwich Mean Time.

The times given are for the Traverse City/Interlochen area of Michigan. They may be different for your location.

Addendum

Mini Moon and Super Moon

Mini Moon and Super Moon for 2017. Trouble is the Moon appears alone with nothing to compare it to when it is seen in the sky. Created using Cartes du Ciel (Sky Charts).

Sun's path through the sky on the equinox

The Sun’s path through the sky on the equinox day from Traverse City, MI. Created using my LookingUp program. (This is from a couple of years ago. The actual length of daylight depends on when during the day the moment of the equinox occurs.  I’ll have more on that Thursday.)

02/19/2019 – Ephemeris – The Moon ain’t just super near the horizon

February 19, 2019 Comments off

Ephemeris for Tuesday, February 19th. Today the Sun will be up for 10 hours and 39 minutes, setting at 6:16, and it will rise tomorrow at 7:35. The Moon, at full today, will rise at 6:28 this evening.

Tonight we will have a super full Moon. It will be the closest full moon of the year, not that you could really tell. The full moon, or waning moon looks large near the horizon when it’s rising. The same is true of waxing moons setting. The same is true of sunrises and sunsets. However if you look closely at the rising or setting Moon or Sun right at the horizon you will notice that it appears a bit squashed. This is due to atmospheric refraction or bending of the light which makes the them appear higher in the sky than they actually are. It is most pronounced near the horizon. In fact by the time the Sun appears to touch the horizon, it is already completely below the horizon, and would appear be if we didn’t have an atmosphere.

The times given are for the Traverse City/Interlochen area of Michigan. They may be different for your location.

Addendum

Suashed Moon at moonrise

The Moon just after moonrise 1 day past full. The Moon appears squashed vertically by about 10% compared to circumscribed circle. Credit Eileen Carlisle.

Atmospheric Refraction

How the atmosphere bends the light of the Sun or Moon rising or setting to appear higher than it actually is. Credit Francisco Javier Blanco González, 2017

 

02/18/2019 – Ephemeris – Super Moon, super math

February 18, 2019 Comments off

Ephemeris for President’s Day, Monday, February 18th. Today the Sun will be up for 10 hours and 36 minutes, setting at 6:15, and it will rise tomorrow at 7:37. The Moon, 1 day before full, will set at 7:52 tomorrow morning.

Ready for some math this morning? This will be easy, because you will only have to think about it. Let’s say the Earth’s radius is 4,000 miles.  That is pretty close to its actual value. OK, it is 3961 miles (6,378 km) at the equator. The Earth is nearly spherical. At 4 this morning the Moon passed perigee, its closest point to the Earth, making tomorrow’s full moon a super-moon. Let’s say it will be at today’s distance of 221,600 miles (356,800 km). That’s center to center. At moon rise or moon set the Moon is near that center to center distance, but if it moves overhead it’s 4,000 miles closer because we are on the Earth facing the Moon. Even though the Moon looks smaller than when it appears on the horizon. It’s an optical illusion that the Moon appears larger when it is rising. Super moon or not.

The times given are for the Traverse City/Interlochen area of Michigan. They may be different for your location.

Addendum

The difference in the Moon's distance at rising (or setting) versus when it is overhead

This illustrates the difference in the Moon’s distance at rising (or setting) versus when it is overhead. BTW today’s perigee puts the Moon at only 56 Earth radii from the Earth. The illustration is mine.

06/09/2017 – Ephemeris – Watch the mini moon rise tonight

June 9, 2017 1 comment

Ephemeris for Friday, June 9th. Today the Sun will be up for 15 hours and 29 minutes, setting at 9:26, and it will rise tomorrow at 5:57. The Moon, at full today, will rise at 9:26 this evening.

In recent years we’ve talked about the super moon, when the full Moon appears especially large because it’s at perigee, or closest to the Earth at that time. Well tonight’s full Moon will be a the opposite, a mini Moon. The Moon reached apogee, its farthest from the Earth in it’s orbit at 6:21 last night, and 15 hours later, at 9:10 this morning the Moon was full. However I bet that when the Moon rises tonight that it will appear just as big as it always does, especially if you forget that it’s supposed to be a mini moon. The Moon is in an elliptical orbit of the Earth that this month varies from 252,500 miles (406,400 km) yesterday down to 222,400 miles (357,900 km) on the 23rd. Thanks to the Sun, and especially Jupiter and Venus, those distances change a bit every month. Tonight Saturn will be seen just below the moon.

The times given are for the Traverse City/Interlochen area of Michigan. They may be different for your location.

Addendum

Mini Moon and Super Moon

Mini Moon and Super Moon for 2017. Created using Cartes du Ciel (Sky Charts).

11/14/2016 – Ephemeris – Watch the setting of the super moon this morning

November 14, 2016 Comments off

Ephemeris for Monday, November 14th.  The Sun will rise at 7:39.  It’ll be up for 9 hours and 36 minutes, setting at 5:15.  The Moon, at full today, will set this morning at 7:23 and will rise again at 5:53 this evening.

During the 6 to 7 o’clock hour this morning the Moon will be officially the closest super moon, most likely of your lifetime unless your 68 or older.  Super moon’s apparently only count when the Moon is closest to the Earth at full moon.  The Moon passes perigee, its closest point to the Earth once a month, but not always at full moon.  It happens that both October and December’s full moons are also super moons.  Rising and setting moon’s work the same way, to make the Moon appear even larger than it is.  This is an optical illusion, but go with it.  The Moon will be slightly farther away when it rises this evening.  Moon set will occur at 7:23 or thereabouts this morning while moon rise will be at 5:53 this evening, somewhat earlier east of Traverse City, later west.  Get out early if it’s clear.

Times are for the Traverse City/Interlochen area of Michigan. They may be different for your location.

Addendum

Full super moon

The nearly full super moon at 8 p..m. EST (1 hr UT) last night. The fact that the moon is not quite full is the dullness on the Moon’s left side and a hint of a crater shadow. The Moon will be as full as it gets at 8:52 a.m. EST (13:52 UT). Credit Bob Moler

For more facts on the super moon check out these links:

http://scienceblogs.com/startswithabang/2016/11/11/supermoon-fact-vs-fiction-synopsis/

http://www.livescience.com/20093-supermoon-moon-myths.html