On Sun 2020-02-02T00:33:08+0100 Warner Losh hath writ: > It's the fact that things like filesystems > specify an elapsed time since an epoch in a time scale without leap > seconds. Every FAT or NTFS disk around has a time like this.
Beginning 2018-06-01 the value of Microsoft Windows FILETIME ceases to be seconds of UT since 1600 and begins to be (TAI - 37 s). Microsoft has decided to become the authoritative point of distribution for the leap second information that no international agency has ever been tasked to be. > Replacing steering systems > for telescopes is likely somewhat less than that. I have already written up how it is not an insurmountable problem for telescope systems, but digging deep into the literature from around 1970 even further invalidates any notion that leap seconds are for astronomers. In the many meetings and recommendations there were several instances where the participants and wording recognized the requests from astronomers to preserve UT. In every instance where a document specified a maximum deviation that agreement was later violated. In one case it was broken specifically because a high official at CCIR conceded to a high official from USSR and directed the BIH to violate the wording of the existing agreement. The leap seconds were included in the CCIR recommendation not because of anything any astronomer said, but because a few of the participants in the CCIR process understood that they did not have the legal authority to cause all nations to change calendar days from mean solar days to atomic days. -- Steve Allen <s...@ucolick.org> WGS-84 (GPS) UCO/Lick Observatory--ISB 260 Natural Sciences II, Room 165 Lat +36.99855 1156 High Street Voice: +1 831 459 3046 Lng -122.06015 Santa Cruz, CA 95064 https://www.ucolick.org/~sla/ Hgt +250 m _______________________________________________ LEAPSECS mailing list LEAPSECS@leapsecond.com https://pairlist6.pair.net/mailman/listinfo/leapsecs