First Day of Astronomical Summer

While meteorologists define summer as the three warmest months (June-July-August) in the Northern Hemisphere, astronomers define summer as starting today.

My friend Jan Null tracks heatstroke deaths of children in vehicles. There have already been twelve of those deaths this year. For more important information from Jan, go here.


  1. The solstice is at 1:04 a.m. on the 21st EDT; 10:04 p.m. on the 20th PDT. So summer begins on Friday, not today. Even in CDT.

  2. Astronomical summer begins at the solstice.

  3. Which is tomorrow - not today.

  4. This piece links to Jan Nulls which pertains to the Pacific time zone. Isn't today the 20th? What am I missing?


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