Fête du Soleil

Journée absolument mémorable pour ce premier jour d'été. En plus de contempler pour la première fois le Soleil en direct à travers des coronographes, ce fut sur la propriété de Pierre Bourge que cela s'est produit.

Grand initiateur en matière d'astronomie, il fut un pionner en France et fit de nombreux émules.

Voici le style d'images que j'ai pu voir hier, dans les coronographes présents.

Cette image est actuelle. J'ai pu observer trois taches au centre

du Soleil, non visible sur cette image ( peut-être grace au voile de cirrus présents hier ).

Image non actuelle. Avoir pu observer les flux de la couronne solaire m'a profondément ému.

Pour finir, une vidéo hommage à Pierre Bourge.

Comments

[neo]

http://www.space.com/26503-supermoon-full-moon-rises-saturday.html?cmpid=557880




Supermoon Saturday: Supersized Full Moon Rises This Weekend



By Kelly Dickerson, Staff Writer   |   July 11, 2014 05:26pm ET







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Get ready for a supersized moon. One of the biggest full moons of the year — a so-called "supermoon" — will light up the night
sky on Saturday (July 12), but is only the first in a lunar triple-play this summer.


During this weekend's supermoon, the July full moon will appear about 30 percent brighter and 14 percent closer than a typical
full moon. Last year, the full moon of June made headlines with its super luminosity. In 2014,
skywatchers will see three supermoons this summer, one each during the
back-to-back full moons in July, August and September.


Supermoons occur when the moon reaches the closest point to Earth, called "perigee," during its month-long orbit. On July 12,
the moon will reach its full phase at 7:25 a.m. EDT (1125 GMT), just under three hours after reaching perigee. To the average observer, the moon can also look full in the day before and after
the actual full moon date. [Supermoon photos from around the
world]


 







Supermoons can appear 30 percent brighter and up to 14 percent larger than typical full moons. Learn what
makes a big full moon a true 'supermoon' in this Space.com infographic.
Credit: Karl Tate/SPACE.com

View full size image





On average, the distance between the Earth and
moon is about 238,855 miles (384,400 kilometers). At perigee, the moon is about 31,000 miles (50,000 km) closer to Earth than at the highest point of its orbit, called
"apogee."


While it may seem strange to stargazers that this summer features three consecutive supermoons, the lunar coincidence is
actually not that rare.


"Generally speaking, full moons occur near perigee every 13 months and 18 days, so it's not all that unusual," Geoff Chester,
from the US Naval Observatory, said in a statement. "In fact, just last year there were
three perigee moons in a row, but only one was widely reported."


To the untrained eye, it can be difficult to spot the difference between a regular full moon and a supermoon. Even though a supermoon is 30 percent brighter, that extra shine can easily be
masked by clouds. Also, with no point of reference, the orb suspended in the sky looks about the same size as an ordinary moon.


However, the supermoons this summer may actually appear
noticeably larger thanks to the "moon illusion," Chester explained.


 



Which of these lunar displays is your favorite skywatching treat?


Supermoon! Not only is it the biggest full moon of the year,
it's super cool.Full Moons: They come around
every month and light up the night.Lunar
Eclipses: There's nothing more spectacular than a blood-red moon in Earth's shadow.Blue Moon: They're rare and amazing, if not actually blue.Solar Eclipses: The moon has the power to block out the sun!



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The moon illusion occurs when the moon rises and stays close to the horizon. For reasons astronomers don't fully
understand, low-hanging moons appear much larger to the observer when they are seen through things like trees and buildings and other objects in the foreground. So a supermoon close to the
horizon can appear especially large.


"The moon illusion is probably what will make people remember this coming set of full moons, more than the actual view of
the moon itself,” Chester said.


As long as the weather is clear, everyone will be able to see the giant moon and its supermoon light on Saturday night. The
other supermoons this summer will occur on Aug. 10 and Sept. 9.


Editor's note: If you snap an
amazing lunar photo of the July "supermoon" full moon and would like to share it with Sp