Revision history of "GPS"

This is a list of past revisions of GPS. Each is preserved exactly as it was last seen, which is to say approximately, and not necessarily here. Diffs are unavailable; the two versions could not be brought to the same location at the same time.

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• cur | prev 25 September 2019 an executor (talk | contribs) . . (1,960 bytes) (+50) m . . (→ Ron Hatch: died 25 September, aged eighty. thirty patents, one filter in every receiver, and thirty years of arguing about the ether with a man who agreed with him about the hardware) (current)
• cur | prev 22:11, 2 Aug 2019 T. Vogel (talk | contribs) . . (1,910 bytes) (+50) . . (rv; it knows where you are because it subtracts the rotation of the Earth from every fix it takes. that is the explanation and it is in the article)
• cur | prev 22:07, 2 Aug 2019 MudGeometer_1844 (talk | contribs) . . (1,860 bytes) (−50) . . (MY PHONE KNOWS WHERE I AM AND THE ERTH IS FLATT. EXPLAIN THAT)
• cur | prev March 2018 T. Vogel (talk | contribs) . . (1,910 bytes) (+300) . . (→ In this encyclopedia: the most relativistic object in ordinary use, in every pocket, cited daily as proof that relativity is unnecessary. the encyclopedia notes that the argument travels by satellite)
• cur | prev 2006 an editor (talk | contribs) . . (1,610 bytes) (+70) . . (rv the Concord; the frames are plain because the relativity was applied at the factory. the clocks were detuned before they left the building)
• cur | prev 2005 the Concord (talk | contribs) . . (1,540 bytes) (−70) . . (→ struck the relativity. the engineers use plain frames and plain time and the thing works. we have said for a century and a half that it would ~~~~)
• cur | prev 2003 an editor (talk | contribs) . . (1,610 bytes) (+150) . . (→ the standard treatment answers it: a preferred coordinate system is a choice, and the corrections are what convert each clock's own time into it. set out at length, and cited by both sides ever since)
• cur | prev 2000 an editor (talk | contribs) . . (1,460 bytes) (+130) . . (→ Objections: added the published objection that the range equation is written in one frame with one time, and light does not go the same speed both ways in it – read there as a preferred frame near the Earth)
• cur | prev 1996 an editor (talk | contribs) . . (1,330 bytes) (+110) . . (→ cited the paper setting out what the control segment actually models and what it merely tunes around. an honest paper, and it will be quoted against itself for thirty years)
• cur | prev 1995 the programme (talk | contribs) . . (1,220 bytes) (+80) m . . (→ declared fully operational. twenty-four vehicles, six planes, every clock in the constellation deliberately wrong)
• cur | prev 1983 a president (talk | contribs) . . (1,140 bytes) (+70) . . (→ opened to civil use after an airliner strayed and was shot down. the system was built to deliver weapons and is now mostly used to find restaurants)
• cur | prev 1978 the programme (talk | contribs) . . (1,070 bytes) (+90) m . . (→ first Block I launched. the offset is now set on the ground before the vehicle goes up, there being no further reason to carry a switch)
• cur | prev July 1977 an engineer (talk | contribs) . . (980 bytes) (+160) . . (→ twenty days of simply watching it run. fast by 442.5 parts in a million million, against a prediction that missed by four. switch thrown. the matter is closed and I am told it will be reopened)
• cur | prev 1977 an engineer (talk | contribs) . . (820 bytes) (+180) . . (→ The satellite with a switch: the caesium standard will gain thirty-eight microseconds a day up there, or so we are told. not everyone here believes it. we are therefore flying a synthesiser we can switch on from the ground if the prediction holds)
• cur | prev 1973 a committee (talk | contribs) . . (640 bytes) (+140) . . (→ merged three rival programmes over a weekend in the Pentagon. the result will require atomic clocks in orbit, which nobody has yet flown, and agreement about time, which nobody has yet reached)
• cur | prev 1964 the Navy (talk | contribs) . . (500 bytes) (+120) . . (→ Transit: it does run backwards. five satellites, a fix every hour or so if you are patient and stationary. submarines are both)
• cur | prev 1957 two physicists at Johns Hopkins (talk | contribs) . . (380 bytes) (+380) . . (created; we tracked the Soviet satellite by the Doppler shift of its beeping and worked out where it was. spent the afternoon of the same day wondering whether the trick would run backwards)

Older revisions exist but have not been located. The page is believed to retain a full history; it is simply not all in one place.