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Strange time difference in 2 days

Pljschoenmakers

August 30, 2017 19:41

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I'm measuring the rise and set of the Pleiades on every day of october and saw an suddenly 1 hour difference. The input I use is rise Pleiades on first date = year 1507 - month 10 - day 26 AD and time = hour 8 - min 1 - sec 1 PM.

Next I increase the day 26 with 1 to 27 and then I get an date = year 1507 - month 10 - day 27 AD with time hour 7 - min 22 - sec 1 PM.

The difference between de two rises of the Pleiades may be max. 4 minutes, but I get this strange difference of 1 hour. Who can explain this strange effect?

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3 comments

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  Bill Tschumy August 30, 2017 19:45

  Daylight Saving Time changed.

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  Pljschoenmakers August 30, 2017 21:32

  Great Bill! I put the switch "Automatic Daylight Savings Time" off and then get the right time again. Thanks, problem solved.

  Paul

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  Bill Tschumy August 30, 2017 21:57

  I don't really think there was a problem.  The time is supposed to jump by an hour when there is a switch to or from DST.  If you turn the automatic switch off then you will not have correct times for things after daylight saving time ends.  This is assuming you live in an area with DST.  That switch is only there for some people that live in areas where DST is not observed.