8 thoughts on “Equinox”

  1. Excuse me, but 3:18 PM MDT would be 2:18 PM PDT, which is the same as Mountain Standard time.

    However Ken B got the calendar part of the question right.

  2. Actually, does it happen instantaneously, or like sunrise, in effect move around the earth and happen at about the same local time in each time zone?

  3. Michelle, the astronomical equinox is the precise moment twice each year when the sun passes directly over the plane of the equator. It happens without regard to the rotation of the Earth (time zones).

  4. The equinox indeed is at 3:18 PM tomorrow (Tuesday, September 22, 2009) MDT. However, except for the Navajo Nation, Arizona does not observe daylight saving time.

    As my brother wrote in comment 2, in Arizona (except for the Navajo Nation) it will be 2:18 PM Mountain Standard Time when the sun appears directly above the equatorial plane.

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