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  • Marla beaver

    Cartoon of Moon-Earth Orbit, illustrating the phases of the moon. The cartoon is labeled Moon-Earth-Sun as viewed from above our solar system. The Earth sits in the center of eight images of the moon at different places in the lunar cycle. To the right the Sun shines on the Moon Earth system.

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    Unit 2 - Moon Phases

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Illustration of Columbus using a lunar eclipse to impress the Indigenous people of Jamaica. (Credit: Astronomie Populaire 1879, p 231 fig. 86) Mona Evans, "Four Historic Eclipses" www.bellaonline.c...

Lunar eclipse of April 2015. Totality was supposed to be very short, but observers report that it didn't even quite happen. There was still a sliver of sunlight on the Moon even at its darkest. (Image credit and copyright: Rolf Wahl Olsen)

Risen moon, unshadowed from our view,/ Toward dawn, glides into darkness./ In uncertain times, a dread omen/ Of ending and descent to shadow.// But this day (for us) a full restoration,/ An amen, fears pacified, night ending./ As Luna’s emerging bright glow/ Is doubled in long & calm reflection.// (Poem & photograph of the Moon emerging from eclipse - Paul Morgan, Los Angeles, April 5, 2015)

Lunar Eclipse - two views - taken brom Treasure Island, San Francisco. 2015-04-04. (Credit: David Yu)

Lunar eclipse in Colorado, 2015.04.04. A telescope shows up a blue band as the Moon emerged from totality. Light penetrating the ozone layer becomes bluer, because ozone absorbs red light. This can be seen as a turquoise-blue border around the red. (Image credit: Jimmy Westlake) Mona Evans, "Blood Moons and Lunar Tetrads" www.bellaonline.c...

Total lunar eclipse. The green light beam is a laser being used to measure the Earth-Moon distance. The laser's target is a retroreflector left on the Moon by Apollo 15 astronauts. Timing the return of the laser pulse allows a highly accurate determination of the distance traveled. Performance is improved during the eclipse because direct sunlight is blocked. (Credit & copyright: Dan Long) Mona Evans, "Blood Moons and Lunar Tetrads" www.bellaonline.c...

A chromolithograph from the German astronomy magazine "Sirius" compares the dark and featureless lunar disk during the eclipse a year after the eruption of Krakatoa (left) with a bright eclipse four years later, after the volcanic aerosols had settled out of the stratosphere (right). Mona Evans, "Blood Moons and Lunar Tetrads" www.bellaonline.c...

During a total lunar eclipse, the moon passes through the outer part of Earth's shadow, called the penumbra, and then into the dark umbra. When fully immersed in the umbra, the moon is in total eclipse or in totality. (Credit: Sagredo) Mona Evans, "Blood Moons and Lunar Tetrads" www.bellaonline.c...

A NASA ScienceCast video explains the lunar eclipse tetrad of 2014-2015. Mona Evans, "Blood Moons and Lunar Tetrads" www.bellaonline.c...

The solar eclipse on Friday, March 20, 2015, photographed at 14,000 meters. (Credit and copyright: Guillaume Cannat) Mona Evans, “Solar Eclipses” www.bellaonline.c...

ISS transit of the Sun during the March 20. 2015 partial solar eclipse. (Credit and copyright: Thierry Legault) Mona Evans, “Solar Eclipses” www.bellaonline.c...

Path of the March 20, 2015 solar eclipse. It occurs on the day of the March equinox, which hasn't happened since the 17th century. The only land areas where the total eclipse may be visible are the Faroe Islands and the island of Svalbard. But Europe, North Africa, parts of the Middle East & north central Asia will have a partial eclipse. Mona Evans, “Solar Eclipses” www.bellaonline.c...

Annular solar eclipse of October 3, 2005, in Tunisia. Baily's beads. They're caused by sunlight getting through lunar valleys just before and after totality. (Credit: Daniel Fischer) Mona Evans "ABC of Astronomy - B is for Bok Globule" www.bellaonline.c...

Solar Eclipse Analemma (Image & copyright: Cenk E. Tezel & Tunç Tezel (TWAN)) Take a picture that includes the Sun in the same place every day & over a year the Sun positions make a figure-8 called an analemma. At northern Winter Solstice the Sun is at the bottom of the analemma. This analemma, shot in Turkey, starting in 2015, includes a total solar eclipse. The base image was taken during totality on 2009-03-29. Mona Evans, “Winter Solstice” www.bellaonline.c...

Asellus Australis (gamma Cancri) and total solar eclipse. In the darkness of a total solar eclipse, stars and planets may be seen during the daytime. Here gamma Cancri is some 0,5 degrees to the left (east) of the totally eclipsed Sun. (Credit: Gote Flodqvist, 1981) Mona Evans, “Solar Eclipses” www.bellaonline.c...

Diamond and Rubies by Tunç Tezel, Turkey. (Highly Commended) A lingering diamond ring before the beginning of totality on 3rd November 2013, as seen from Pajengo village near Pakwach, Uganda. There was also a thin layer of clouds, which diffused the lights of the diamond and red ring of chromosphere around the Moon. Mona Evans, "Astronomy Photographer of the Year 2014" www.bellaonline.c...

Partial Solar Eclipse. (2013-10-23) (Credit: Jeremy Perez Flagstaff, Arizona, USA) This is a splendid photo of the eclipse. Mona Evans, “Solar Eclipses” www.bellaonline.c...

Partial solar ecllipse 2014-10-23. (Credit: James W. Young from Wrightwood, California) You can see the eclipsed Sun and, as a bonus, the Jupiter-sized sunspot AR2192. Mona Evans, “Solar Eclipses” www.bellaonline.c...

The October 8th 2014 lunar eclipse from Houston, Texas, featuring a statue of Sam Houston. (Credit and copyright: Sergio Garcia Rill) Mona Evans, “Lunar Eclipses” www.bellaonline.c...

Hybrid Solar Eclipse 2, by Eugen Kamenew, Germany. People & Space winner. The eclipse began as an annular eclipse at sunrise, but it became total as it crossed the Atlantic. By the time it reached Kenya the Sun was just emerging, creating the dramatic silhouette of the figure on the hill. Mona Evans, "Astronomy Photographer of the Year 2014" www.bellaonline.c...

Lunar Eclipse infographic. (Credit: Karl Tate) Mona Evans, “Lunar Eclipses” www.bellaonline.c...

Headlines in the New York Times November 10, 1919. The results from the English eclipse expeditions confirmed Einstein's predictions in his theory of general relativity. It was sensational. Mona Evans, "Einstein's Eclipse" www.bellaonline.c...

Eclipsed moon with turquoise fringe. 2014-04-15. (Image: Robert & Elisabeth Slobins) Prof Richard Keen says that "most of the light illuminating the Moon passes through the stratosphere, and is reddened by scattering. But light passing through the upper stratosphere penetrates the ozone layer, which absorbs red light & actually makes the passing light ray bluer!" ©Mona Evans, “Lunar Eclipses” www.bellaonline.c...

Geometry of a solar eclipse. Since the Moon is small compared to Earth its shadow is narrow. Any place where the darker part of the shadow (the umbra) falls would have a total eclipse, but within the outer part of the shadow (the penumbra) the eclipse is only partial. Mona Evans, "Solar Eclipses" www.bellaonline.c...

Phases of the Moon. A solar eclipse can only occur at the new Moon because that's the only time that Sun, Moon and Earth could line up with the Moon blocking the Sun from our view. ©Mona Evans, “Solar Eclipses” www.bellaonline.c...