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A total eclipse of the Sun has not been seen in the continental USA for nearly two generations. Although people may opt for the longer durations in eastern regions of the USA, poorer weather prospects here suggest going west. Prudence may suggest observing from regions of good weather prospects with shorter durations than locations with longer durations that have higher probabilities of not seeing the eclipse at all. Currently maximum total eclipse durations are declining with the 2009 July eclipse longest of the 21st Century.
Finally, maximum duration of a total solar eclipse occurs only on the center line of the eclipse path about mid-way between its ends. Read about the Eclipse at Madras, Oregon including circumstance of the eclipse in Part  4. Contact us with a description of the clipart you are searching for and we'll help you find it.
If you can't find the clipart your looking for then please do not hesitate to get in touch and we will gladly help. A seven minute duration will not happen again until 2150 June (7m14s) while a total eclipse with a duration near maximum is nearly two centuries in the future.


Not until 2078 will total eclipse durations begin to increase when Saros cycle 139 begins to bring eclipses of longer and longer durations. This position may often be difficult to access as it was, for example, during the 2012 November Australia eclipse. Although eclipse durations have their maximum values along points on the central line, these durations diminish with increasing distance from the central line. Almost half are approximately three minutes or less (as will be with the 2017 August eclipse).
This will not happen until the remarkable 2186 July total eclipse (7m29s), the longest duration of totality during the years -2000 to +4000. For this eclipse, maximum duration was 4m02s over the central Pacific Ocean and not the Australian mainland. Annular eclipses occur when the Moon's disk is not large enough to hide the entire solar disk at maximum eclipse. Unfortunately, this long duration will take place about 400 mi (640 km) east of South America in the Atlantic Ocean, 500 mi (800 km) north of the equator. Fortunately, greatest duration for the 2017 August eclipse does occur over the mainland USA. Totality is a two minute eclipse on the West Coast with the east coast having 34 seconds more.


Thus, western location may again have an advantage since summer storms tend to build during afternoon hours, a common occurrence during summer months. The duration of totality decreases slowly at first with the distance from the central line of totality then increases rapidly. Although much less spectacular than total solar eclipses, central durations are often much longer.
The approximate range in altitude of the Sun in degrees during the eclipse is also shown for both west and east regions.
For example, at a distance of 60% away from the central line to the edge of totality, the duration is still 80% of maximum. Even if the fractional distance from the central line is one half, the loss in duration is only about 15%. Hence, observers usually do not need to be exactly on the central line to experience most of the duration of totality.




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Comments

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