Blue Moon coming! If you see the moon in tonight’s sky, you’ll see it’s nearly full. In fact, it’ll likely look like a full moon to you. Look at the calendar, and it’ll probably tell you that this month’s second full moon will fall tomorrow – on July 31, 2015. However, for much of North America, it’ll actually turn precisely full before sunrise tomorrow, on July 31. Thus many will call tomorrow’s full moon – and probably tonight’s nearly full moon as well – a Blue Moon.
Will you see the moon as blue in color? Nope. The name Blue Moon has nothing to do with the color blue. It’s just a name for the second full moon in a calendar month.
Read about the origin of the name Blue moon here
If the moon won’t be blue in color tonight or tomorrow night, what will it look like? It’ll look like any ordinary full moon.
This month’s moon turns precisely full on July 31 at 10:43 Universal Time – the standard clock time at the prime meridian of 0o longitude.
Translating Universal Time to the time zones in the mainland U.S., we see that the moon will reach the crest of its full phase at 6:43 a.m. EDT, 5:43 a.m. CDT, 4:43 a.m. MDT or 3:43 a.m. PDT on the morning of July 31. Does that mean you should look for the moon at those exact times? Not necessarily. Those times just indicate when the moon is precisely full.
As always, the moon at the vicinity of full phase remains pretty much opposite the sun all night long – rising around sunset, overhead around midnight, setting around sunrise.
So even though tonight’s moon will look plenty full as it lights up the nighttime from dusk until dawn, the full moon – astronomically speaking – only represents a fleeting instant of time.
It’s when the moon stands 180o opposite the sun in ecliptic longitude.
Everything you need to know about the July 31 Blue Moon
Image credit, top of post: Ava Verino on Flickr
Meteors ahead! Everything you need to know: Perseid meteor shower
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Day and night sides of Earth at instant of July 31 full moon
Day and night sides of earth at the instant of the July 31 full moon (2015 July 31 at 10:43 Universal Tine). Image credit via Earth & Moon Viewer
Bottom line: The July 31, 2015 full moon won’t appear blue in color. But – as the second of two full moons to occur in a single calendar month – many will call it a Blue Moon.
EarthSky astronomy kits are perfect for beginners. Order today from the EarthSky store
Donate: Your support means the world to us
from EarthSky http://ift.tt/1LvY8XW
Blue Moon coming! If you see the moon in tonight’s sky, you’ll see it’s nearly full. In fact, it’ll likely look like a full moon to you. Look at the calendar, and it’ll probably tell you that this month’s second full moon will fall tomorrow – on July 31, 2015. However, for much of North America, it’ll actually turn precisely full before sunrise tomorrow, on July 31. Thus many will call tomorrow’s full moon – and probably tonight’s nearly full moon as well – a Blue Moon.
Will you see the moon as blue in color? Nope. The name Blue Moon has nothing to do with the color blue. It’s just a name for the second full moon in a calendar month.
Read about the origin of the name Blue moon here
If the moon won’t be blue in color tonight or tomorrow night, what will it look like? It’ll look like any ordinary full moon.
This month’s moon turns precisely full on July 31 at 10:43 Universal Time – the standard clock time at the prime meridian of 0o longitude.
Translating Universal Time to the time zones in the mainland U.S., we see that the moon will reach the crest of its full phase at 6:43 a.m. EDT, 5:43 a.m. CDT, 4:43 a.m. MDT or 3:43 a.m. PDT on the morning of July 31. Does that mean you should look for the moon at those exact times? Not necessarily. Those times just indicate when the moon is precisely full.
As always, the moon at the vicinity of full phase remains pretty much opposite the sun all night long – rising around sunset, overhead around midnight, setting around sunrise.
So even though tonight’s moon will look plenty full as it lights up the nighttime from dusk until dawn, the full moon – astronomically speaking – only represents a fleeting instant of time.
It’s when the moon stands 180o opposite the sun in ecliptic longitude.
Everything you need to know about the July 31 Blue Moon
Image credit, top of post: Ava Verino on Flickr
Meteors ahead! Everything you need to know: Perseid meteor shower
Enjoying EarthSky so far? Sign up for our free daily newsletter today!
Day and night sides of Earth at instant of July 31 full moon
Day and night sides of earth at the instant of the July 31 full moon (2015 July 31 at 10:43 Universal Tine). Image credit via Earth & Moon Viewer
Bottom line: The July 31, 2015 full moon won’t appear blue in color. But – as the second of two full moons to occur in a single calendar month – many will call it a Blue Moon.
EarthSky astronomy kits are perfect for beginners. Order today from the EarthSky store
Donate: Your support means the world to us
from EarthSky http://ift.tt/1LvY8XW
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