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COURSE Introduction to Astronomy (34)

MUTUAL PHENOMENA of the Galilean satellites

Jupiter, the largest planet in our solar system, currently has 17 satellites. The first four: Io (a satellite with volcanic activity), Europa, Ganymede and Callisto were descubietos by Galileo Galilei. In her honor these four moons are called the Galilean satellites.
The four Galilean satellites can be observed with optical medium, and assessed the following events or details:
1) ECLIPSES: produced when a satellite enters the shadow of Jupiter.
2) Hide: those that are produced by a satellite passing behind the planet Jupiter.
3) STEPS: occur when a satellite is interposed between Jupiter and Earth.
4) STEPS OF SHADOW: are caused by the projection of the shadow of a satellite on the planet.

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COURSE Introduction to Astronomy (33)

apparent position of the outer planets.

outer planets are those located further away from the Sun than the Earth. They are: Mars, Jupiter, Saturn, Neptune, Uranus and Pluto.
When the Earth and outer planet are on opposite sides of the Sun, says that the planet is in conjunction. This is the time when the planet is behind the sun, making it impossible to observe. It is said that an outer planet is in opposition when the planet is at its closest position to Earth, this is visible all night: The Sun sets in the west and the planet rises in the east. As time passes, the planet rises until it sets in the west, more or less at the time the sun will rise in the east.
You can see a planet during the time that is not in opposition. The closer you get less time to their conjunction can be seen in the sky. It is said that an outer planet is in quadrature with the Sun when the angle of the planet Earth and the Sun at a right angle of 90 degrees. You can observe a phase effect on some outer planets.

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COURSE Introduction to Astronomy (32) COURSE A LA

Danjon SCALE

During the eclipse the Moon has a degree of visibility known as the Danjon Scale.
0 = Very dark eclipse, the Moon is almost invisible.
1 = Eclipse, gray or brown. Eclipse
2 = dark red or rusty color, shadow edges clear. Eclipse
3 = brick red, or yellow light shade. Eclipse
4 = very clear, coppery red with blue trim.

eclipsed Moon can stay for 1 hour, 45 minutes maximum, then the Moon out of the shade with a small growing light, will widen to the left of limbo, until the shadow leaves the disk and then the darkness is lifted. The eclipse is over and can last about six hours.