An Omer is a unit of measure for barely. On the second day of Passover, an omer of grain was offered in the Temple. Fifty days were then counted. The fiftieth day is Shavuot, when two wheat loaves were offered.
During the time of Rabbi Akiva, 24,000 perished in a plague during the Counting of Omer. The plague stopped on the 33rd day. So, the ending of the plague is celebrated for 33 days into the Counting of Omar. This holiday is Lag B'Omer.
|Year||Starts on Sunset on||Ends at Sunset on|
|2013||Saturday, April 27th||Sunday, April 28th|
|2014||Saturday, May 17th||Sunday, May 18th|
|2015||Wednesday, May 6th||Thursday, May 7th|
|2016||Wednesday, May 25th||Thursday, May 26th|
|2017||Saturday, May 13th||Sunday, May 14th|
|2018||Wednesday, May 2nd||Thursday, May 3rd|
|2019||Wednesday, May 22nd||Thursday, May 23rd|
|2020||Monday, May 11th||Tuesday, May 12th|
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When is Passover (Pesach)?
When is Lag B'Omer?
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When is Tisha Bav?