eclipses by: hiromi and michelle. eclipse types solar lunar
TRANSCRIPT
Solar• Definition- The obscuration of the light of the
moon by the intervention of the earth between it and the sun
• Records of Solar eclipse have been around since ancient times
• Magnitude- fraction of the sun covered by the moon
Partial (Penumbra)
• The sun and the moon are not exactly in line causing the moon only partially blocks the sun
• The umbra passes above the Earth’s Polar region, but never crosses Earth’s surface
Annular (Antumbra)• Moon and Sun are in line• Moon is smaller than the sun so it isn’t completely
covered• Sun shines behind the moon in a bright ring (annulus)• Diamond ring effect- see a shinning halo (Corona), which is usually not visible
Total (Umbra)• The moon completely
covers the sun causing a darkness in the sky
• Earth intersects the umbra portion of the moon’s shadow
• Last as long as 7 minutes 31 seconds
Hybrid “oddball”• A solar eclipse that
shifts between a annular and a total eclipse
• Changes depending on where you are on Earth
• Extremely rare
Observing a Partial Solar Eclipse
• Pinhole camera • Solar filter• Welders’ goggles• Exposed/developed black and white film
Occurrences• Between 2-5 times a year• (total solar eclipses can only happen 2 times a
year)• Last total solar eclipse was on July 11, 2010• Next is said to be November 13, 2012
Video
• http://www.youtube.com/watch?v=xwGs8_otT64
What is Lunar Eclipse? When does it happen?
• When moon passes through the Earth’s shadow.
• Happens only when the moon is on the far side of the Earth from the sun.
• Can be seen from the entire Hemisphere.
Positions of the Moon During a Lunar eclipse
• Far away from the sun
• Behind the Earth’s shadow caused by the sun
Usual Duration (completion) of the Eclipse:
Usually last over 1 hour; least duration time 30 minutes.
Types of Lunar Eclipse
• A) Penumbral Lunar Eclipse
• B) Partial Lunar Eclipse
• C) Total Lunar Eclipse
WHY RED?
• It is caused by the sunlight passing through the Earth’s hemisphere.
• The remaining light coming out of the hemisphere is redish-orange.
Some Facts…..
• Lunar Eclipse occurs 0 to 3 times each year• There are 7,718 lunar eclipses recorded
throughout history• This year lunar eclipse is scheduled to June 15
and December 10.
Sample Video of Lunar Eclipse from Dec 21, 2010; this lasted almost 4 hours and 30 mins:
http://www.youtube.com/watch?v=mhZWIgUUPZ8
Works Cited• Espenak, Fred, and Mark Littmann. "Observing Solar Eclipses
Safely." MrEclipse Index. 1999. Web. 19 Jan. 2011. <http://www.mreclipse.com/Totality/TotalityCh11.html>.
• Espenak, Fred. "Solar Eclipses for Beginners." MrEclipse Index. 2009. Web. 19 Jan. 2011. <http://www.mreclipse.com/Special/SEprimer.html>.
• "Solar Eclipse." Wikipedia, the Free Encyclopedia. 14 Jan. 2011. Web. 19 Jan. 2011. <http://en.wikipedia.org/wiki/Solar_eclipse>.
• "Lunar Eclipses for Beginners." MrEclipse Index. Web. 21 Jan. 2011. http://mreclipse.com/Special/LEprimer.html.
• "Eclipse." Wikipedia, the Free Encyclopedia. Web. 21 Jan. 2011. <http://en.wikipedia.org/wiki/Eclipse>.