Re: MJD and leap seconds

2006-01-10 Thread Peter Bunclark
On Tue, 10 Jan 2006, Tom Van Baak wrote: have no leap seconds. Astronomers appear to avoid using MJD altogether. Good grief. MJD is used widely in astronomy, for example in variablility studies where you want a real number to represent time rather than deal with the complications of parsing a

Re: MJD and leap seconds

2006-01-10 Thread Poul-Henning Kamp
In message [EMAIL PROTECTED], Peter Bunclark writes: On Tue, 10 Jan 2006, Tom Van Baak wrote: have no leap seconds. Astronomers appear to avoid using MJD altogether. Good grief. MJD is used widely in astronomy, for example in variablility studies where you want a real number to represent time

Re: MJD and leap seconds

2006-01-10 Thread Peter Bunclark
On Tue, 10 Jan 2006, Poul-Henning Kamp wrote: In message [EMAIL PROTECTED], Peter Bunclark writes: On Tue, 10 Jan 2006, Tom Van Baak wrote: have no leap seconds. Astronomers appear to avoid using MJD altogether. Good grief. MJD is used widely in astronomy, for example in variablility

Re: MJD and leap seconds

2006-01-10 Thread Rob Seaman
On Jan 10, 2006, at 9:17 AM, Peter Bunclark wrote:On Tue, 10 Jan 2006, Poul-Henning Kamp wrote:In message [EMAIL PROTECTED], Peter Bunclark writes: Good grief.  MJD is used widely in astronomy, for example in variablility studies where you want a real number to represent time rather than deal with

Re: MJD and leap seconds

2006-01-10 Thread Poul-Henning Kamp
In message [EMAIL PROTECTED], Rob Seaman writes: 2. Julian Date (JD) [...] For that purpose it is recommended that JD be specified as SI seconds in Terrestrial Time (TT) where the length of day is 86,400 SI seconds. Let me see if understood that right: In order to avoid computing problems

Re: MJD and leap seconds

2006-01-10 Thread Rob Seaman
On Jan 10, 2006, at 11:06 AM, Poul-Henning Kamp wrote: Let me see if understood that right: In order to avoid computing problems and to get precise time, astronomers rely on a timescale without leapseconds, because the Earths rotation is too unstable a clock for their purposes. Just like