Details about Solar and Lunar Eclipses ^^

1. SHADOWS AND
SOLAR-LUNAR
ECLIPSES
BY: BOLISLIS, VALERI

2. WHAT IS A SHADOW?
• A shadow is an area where direct light from a
light source cannot reach due to obstruction by
an object. It occupies all of the space behind
an opaque object with light in front of it.
The cross section of a shadow is a two
dimensional silhouette, or reverse projection of
the object blocking the light.The angle of the
sun, its apparent height in the sky causes a
change in the length of shadows. Low-angles
create longer shadows.

3. WHAT IS AN ECLIPSE?
• An eclipse is a natural phenomenon.
Nevertheless, in some ancient and
modern cultures, solar eclipses have
been attributed to supernatural causes
or regarded as bad omens. A total solar
eclipse can be frightening to people who
are unaware of its astronomical
explanation, as the Sun seems to
disappear during the day and the sky
darkens in a matter of minutes.

5. WHAT IS AN UMBRA?
• The umbra (Latin: shadow) is
the darkest part of a shadow.
From within the umbra, the
source of light is completely
concealed by the occulting body.
In astronomy, an observer in the
umbra is said to be experiencing
a total eclipse.

6. WHAT IS A PENUMBRA?
• The penumbra (Latin: paenes
"almost, nearly" + umbra "shadow")
the region in which only a portion of
the occulting body is obscuring the
light source. An observer in the
penumbra experiences a partial
eclipse.

7. WHAT IS AN ANTUMBRA?
• The antumbra is the region from which
the occulting body appears entirely
contained within the disc of the light
source. If an observer in the antumbra
moves closer to the light source, the
apparent size of the occulting body
increases until it causes a full umbra.
An observer in this region experiences
an annular eclipse.

8. SOLAR ECLPISE

9. WHAT IS A SOLAR ECLIPSE?
• As seen from the Earth, a solar eclipse is a type
of eclipse that occurs when the Moon passes
between the Sun and Earth, and the Moon fully
or partially blocks ("occults") the Sun. This can
happen only at new moon, when the Sun and
the Moon are in conjunction as seen from Earth
in an alignment referred to as syzygy. In a
total eclipse, the disk of the Sun is fully
obscured by the Moon. In partial and annular
eclipses only part of the Sun is obscured.

10. 4 TYPES OF SOLAR
ECLIPSES

11. TOTAL ECLIPSE
• Occurs when the dark silhouette of
the Moon completely obscures the
intensely bright light of the Sun,
allowing the much fainter
solar corona to be visible. During any
one eclipse, totality occurs at best
only in a narrow track on the surface
of Earth.

14. ANNULAR ECLIPSE
• occurs when the Sun and Moon
are exactly in line, but the
apparent size of the Moon is
smaller than that of the Sun.
Hence the Sun appears as a very
bright ring, or annulus,
surrounding the dark disk of the

18. HYBRID ECLIPSE (
ANNULAR/TOTAL ECLIPSE)
• Shifts between a total and annular
eclipse. At certain points on the
surface of Earth it appears as a
total eclipse, whereas at other
points it appears as annular.
Hybrid eclipses are comparatively
rare.

20. PARTIAL ECLIPSE
• Occurs when the Sun and Moon are not
exactly in line and the Moon only partially
obscures the Sun. This phenomenon can
usually be seen from a large part of Earth
outside of the track of an annular or total
eclipse. However, some eclipses can only
be seen as a partial eclipse, because
the umbra passes above the Earth's polar
regions and never intersects Earth's

23. LUNAR
ECLIPSE

24. WHAT IS A LUNAR ECLIPSE?
• A lunar eclipse occurs when
the Moon passes directly behind
the Earth into its umbra (shadow).
This can occur only when the Sun,
Earth, and Moon are aligned (in
"syzygy") exactly, or very closely so,
with the Earth in the middle. Hence,
a lunar eclipse can only occur the
night of a full moon.

25. 3 TYPES OF LUNAR
ECLIPSES

26. TOTAL LUNAR ECLIPSE
• A total lunar eclipse occurs when
the whole moon disappears as it
passes through the Earth's
umbral shadow. This is when the
moon emits very
different vibrant colors which
are breathtakingly beautiful.

29. PARTIAL LUNAR ECLIPSE
• A partial lunar eclipse occurs
when a portion of the moon
passes through the Earth's
umbral shadow. This is easy to
see and can be viewed by
the naked eye without any
danger of damage to the eye
whatsoever.

32. PENUMBRAL LUNAR
ECLIPSE
•A penumbral eclipse is
when the moon passes
through the Earth's
penumbral shadow, but
this is very difficult to see.