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Iniciación COURSE A LA ASTRONOMY (24)

OTHER ASPECTS OF THE ECLIPSE OF THE SUN.

If the moon is at an angular distance less than 15 ° 21 of the node will be a partial solar eclipse this type of eclipse the moon does not touch anywhere on the Earth's surface and occurs at high latitudes (North or south). All partial eclipse takes place in two contacts. The first contact is the moment of contact between the solar and lunar discs, marking the beginning of the phenomenon. Following the progress of the moon, we reached the middle of the eclipse, which motion covers a larger fraction of the solar disk. From this point the Moon begins to leave until the last contact, the end of partial eclipse.
If the new moon is between 9 º 11 º 50'y 55'del node, the umbra will reach the Earth, resulting in an annular solar eclipse, the moon is here at the apogee and the Earth at perihelion, then the umbra is remains at 39,400 km, the center of the Earth and creates a negative or antiumbra umbra. Image of the Moon appears smaller than the Sun showing silhouettes on the bright solar photosphere. This type of eclipse has four contacts. There is a partial phase which will produce the first contact, or moment that you first touch both discs. Gradually, for an hour and a half, the solar disk will hide until the second contact occurs: when the lunar disk completely enters the solar surface. Starts central or annular phase, culminating in the middle of the event. Subsequently reversed with a third contact processes or end of the fourth annular contact or view the eclipse. Outside the annular area the observer located in the shadows, sees the phenomenon as partial. When
the new moon is less than 9 ° 55'del node and the perigee, while the Earth at aphelion, the umbra intersects the Earth producing a total solar eclipse shadow cones produce a sweep on the surface Earth called path of totality, from which the phenomenon is seen as total, out of the umbra the event is seen as partial. Total eclipses have four contacts. In the first contact both discs are played but before reaching the second contact, the ambient light changes dramatically and atmospheric parameters change. At the instant of second contact occurs diamond ring, a glow that the effect of radiation is place at the point where the photosphere disappears.