A Little Knowledge
(p.naga prasasd)
A little knowledge
Why are Eclipses so rare? When
themoon in its journey around the earth passes directly
between the earth and the sun,it casts its shadow on the
surface of the earth, and an eclipse of the sun takes
place. An eclipses of the sun occurs on ly when themoon is
new, for then the moon is n that side of the earth facing
toward the sun. Then why isn?t there an eclipse of the sun
every there?s a new moon? The reason is that thepath of the
moon around the earthdoesnot lie directly in line with the
orbit of the earth about the sun. In its 29-day trip
around the earth,the moon passes sometimes above and
sometimes below the path of the earth. An eclipse of the
sun can be total, annular,or partial. If the moon hides
the sun completely, the eclipse is total. But the monn is
not always the same distance form the earth. Often,it is
too far from the earth to hide the sun completely.
Then,when an eclipse takes place, the moon is seen as a
dark disk,which covers the whole sun except a narrow ring
around its edge. This thincircel of light is called?the
annulus?,meaning,?ring. This is an annular eclipse. An
eclipse is partial whenever only part of the disk of the
moon comes between the sun and the earth. An eclipse of
the moon occurs ony when the moon is full, for then it is
at the opposite side of the earth from the sun. When the
moon comes directly behind the earth, as seen for the sea,
it passes gradually into the great shadow-cone cast by the
earth and disappears from view. A total eclipse of the
moon then occurs. Insome years,no eclipses of the moon
occur. In other years, theremust be at least two solar
eclipses, and there maybe as many as five. At anyone plac
eonthe earth?s surface, a total solar eclipse will be
visible only once in about 360 years.
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