http://www.usatoday.com/story/weather/2015/04/02/lunar-eclipse-blood-moon/70831278/
http://sanfrancisco.cbslocal.com/2015/04/01/blood-moon-with-total-lunar-eclipse-biblical-message-rising-over-u-s-during-easter-weekend/
The total phase of the lunar eclipse will only last about 5 minutes, making it the shortest lunar eclipse of the century on the morning of Easter Vigil, traditionally observed as the period between Good Friday and Easter Sunday. The eclipse also falls within the first night of Passover, observed by Jews worldwide beginning Friday at sunset.
Lunar eclipses usually come in no particular order, but sometimes the sequence is more orderly. When four lunar eclipses are all total, the series is called a tetrad.
This Saturday will be the third of four total eclipses in the 18-month long tetrad series. Previous eclipses occurred on April 15, 2014 and. Oct. 8, 2014. After Saturday, the next one is expected on Sept. 28, 2015. Such a closely-spaced succession of eclipses is a fairly rare occurrence.
Depending upon the century in which you live, a lunar tetrad (four consecutive total lunar eclipses, spaced at six lunar months apart from one another) may happen fairly frequently – or not at all.
For instance, in our 21st century (2001-2100), there are a total 8 tetrads, but in the 17th, 18th and 19th centuries, there were none at all. If we include all the centuries from the 1st century (AD 1-100) through the 21st century (2001-2100), inclusive, there are a total of
62 tetrads. The last one occurred in 2003-2004, and the next one after the 2014-2015 tetrad will happen in 2032-2033.
However, if we want to know which tetrads specifically fell on the Jewish feasts of Passover and Tabernacles, there appear to be a total of 8 in these 21 centuries:
1. 162-163 C.E. (Common Era)
2. 795-796 C.E.
3. 842-843 C.E.
4. 860-861 C.E.
5. 1493-1494 C.E.
6. 1949-1950 C.E.
7. 1967-1968 C.E.
8. 2014-2015 C.E.
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