Hi All, Just for clarification - Heavens-Above calculations are all perfomed using UTC, and only when formatted for the web browser are they converted to local time. If daylight savings time ends during a pass, the end of the pass will be reported without daylight time and the start of the pass with, so the end time could be "before" the start. Chris Chris Peat, Heavens-Above GmbH E-mail: chris.peat@heavens-above.com WWW: www.heavens-above.com -----Original Message----- From: Tom Wagner [mailto:sciteach@mchsi.com] Sent: 27 October 2002 21:52 To: SeeSat Subject: Daylight vs. Standard Time Hi all, Last night I sent a member (Linda) a chart depicting a satellite pass that I obtained from Heavens-Above. As I recall the pass was going to occur this morning shortly after the official switch from daylight savings time to standard time, that is for many places in the US. Linda then brought up a good question that lead me to think of a hypothetical situation that I find interesting. [I'm afraid that the answer to this may be obvious to everyone but me. I just haven't taken a lot of time to think it through. :~) ] Here goes. Let's say that in Chris Peat's H-A program, daylight savings time switches over to standard time DURING a satellite's pass, like at local 2:00 AM. What then? Would the time listed be daylight savings time if the pass started before the switch or standard time if the switch occurred after the beginning of the pass? According to what we hear on the news, we were to "turn back our clocks one hour this Sunday (today here in the US) at 2:00 A.M."--like I'm going to get up to do that! :~) Now I have never thought about this before but since this is local time, or so it seems, does that mean that for one hour my local time is the same as one time zone west of me? If so, no wonder they make the official switch in the wee hours of the morning! It is no wonder many of you use Universal Time! Thanks for any mind relief anyone can give me. Tom Iowa USA ..... Internet time? Now this is new to me. See: http://www.jamesshuggins.com/h/tek1/internettime.htm ----------------------------------------------------------------- Unsubscribe from SeeSat-L by sending a message with 'unsubscribe' in the SUBJECT to SeeSat-L-request@lists.satellite.eu.org http://www.satellite.eu.org/seesat/seesatindex.html ----------------------------------------------------------------- Unsubscribe from SeeSat-L by sending a message with 'unsubscribe' in the SUBJECT to SeeSat-L-request@lists.satellite.eu.org http://www.satellite.eu.org/seesat/seesatindex.html
This archive was generated by hypermail 2b29 : Wed Oct 30 2002 - 04:15:12 EST