Mars Clock |
Mars Clock |
Aug 15 2012, 12:17 AM
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#1
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Newbie Group: Members Posts: 10 Joined: 14-August 12 Member No.: 6554 |
I recently built this:
http://jtauber.github.com/mars-clock/ It's a single web page with calculations being done live in Javascript. It started off just as a way to calculate the LMST and LTST for Curiosity but it has a range of calculations for Mars overall from Allison and McEwen's 2000 paper. Recently I've started adding explanations of each of the calculations including the formulas used. It's been a huge learning experience for me and I'd appreciate any feedback, both in terms of experts correcting what I've done incorrectly and amateurs such as my self saying what they'd like elaboration on. |
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Aug 15 2012, 03:23 PM
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#2
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Senior Member Group: Members Posts: 4250 Joined: 17-January 05 Member No.: 152 |
This is looking good, James. Your Oppy time agrees well with Lemmon's Oppy clock, which shows LMST. What is HLST?
Your Oppy clock differs from the MER filenames clock, but then that one shows LTST. |
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Aug 15 2012, 07:06 PM
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#3
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Newbie Group: Members Posts: 10 Joined: 14-August 12 Member No.: 6554 |
This is looking good, James. Your Oppy time agrees well with Lemmon's Oppy clock, which shows LMST. What is HLST? HLST = Hybrid Local Solar Time (according to http://en.wikipedia.org/wiki/Timekeeping_on_Mars) I first saw the term used on http://www.lpl.arizona.edu/~lemmon/mars-tau-b.html (presumably the same Lemmon ) Your Oppy clock differs from the MER filenames clock, but then that one shows LTST. If HLST is in fact LMST (which Lemmon's Oppy clock suggests it is) then I should be able to add LTST easily (as I just need to add the equation of time) Thanks! |
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Aug 17 2012, 02:15 AM
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#4
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Newbie Group: Members Posts: 10 Joined: 14-August 12 Member No.: 6554 |
I've added LTST for Opportunity but it disagrees with http://www.greuti.ch/oppy/html/filenames_ltst.htm
I just added the equation of time to the LMST but not sure what the other site is doing differently. |
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Aug 17 2012, 05:51 AM
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#5
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Dublin Correspondent Group: Admin Posts: 1799 Joined: 28-March 05 From: Celbridge, Ireland Member No.: 220 |
LTST caused Tman issues when he built that if I recall correctly. I know there was a +-10 minute error problem at one stage but I can't recall how he corrected it. I remember that he used an old perl script of mine to look at an alternative way to calculate it but my code was based on the same sources as yours and I haven't looked at it in years so I can't throw any light on the issue right now.
You might find something in the original discussion here and it could be worth sending a PM to Tman. He hasn't logged in since late last year but a PM might alert him by e-mail and elicit a response. |
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