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Re: Time Woes [message #30560 is a reply to message #30471]

Thu, 02 May 2002 06:07

Ken Mankoff
Messages: 158
Registered: February 2000

Senior Member

On Wed, 1 May 2002, Paul Van Delst wrote:
> David Fanning wrote:
>> Ken Mankoff (mankoff@I.HATE.SPAM.cs.colorado.edu) writes:
>>> First, before you deal with any conversions, you have to understand
>>> exactly what it means to have "seconds since 1980".
>>
>> What questions would it be helpful for me to know to ask?
>
> Is the time "regular" time, or atomic time?

I would not ask anything as eloquent as this. I would ask 1 of 2
things. First, "Can I get the data on a different grid", and second
would be what I asked you: A long rambling paragraph asking how many
seconds are in a year, etc. So I suggest you take Paul's advice.

> p.s. I always thought the "seconds since 1980" time was a relatively
> common thing.

I always thought that "time" was a relatively common/simple thing
too... until I started working with satellites and space.

I think "seconds since 19X0 (where X is 7 or 8)" is common in
computers, and that the computer community assumes 60s*60m*24h*365d
seconds in a year, unless its a leap-year. I would guess this is what
Davids time-scale is, but if its not, the errors between the above
equation and whatever his time is on will add up (especially if you
add up 20 years of errors, and stop right before a leap-year when the
errors "reset" a bit), that he will not be looking at data within 2
hours of each other.

-k.
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http://lasp.colorado.edu/mars/
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[Message index]

		Time Woes By: David Fanning on Wed, 01 May 2002 12:41
		Re: Time Woes By: Craig Markwardt on Thu, 02 May 2002 15:26
		Re: Time Woes By: thompson on Thu, 02 May 2002 14:51
		Re: Time Woes By: btupper on Thu, 09 May 2002 07:21
		CDF_EPOCH (was Re: Time Woes) By: Brian Jackel on Thu, 02 May 2002 12:05
		Re: Time Woes By: Struan Gray on Thu, 02 May 2002 08:34
		Re: Time Woes By: David Fanning on Thu, 02 May 2002 06:38
		Re: Time Woes By: btupper on Thu, 02 May 2002 06:11
		Re: Time Woes By: Ken Mankoff on Thu, 02 May 2002 06:07
		Re: Time Woes By: Paul Van Delst[1] on Wed, 01 May 2002 14:24
		Re: Time Woes By: David Fanning on Wed, 01 May 2002 14:00
		Re: Time Woes By: Robert Stockwell on Mon, 06 May 2002 06:14
		Re: Time Woes By: Ken Mankoff on Wed, 01 May 2002 13:10

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