--- I) Existence [Adopt an international (or intergalactic) civil time standard?] A) yes B) no II) Multiplicity [How many standards?] A) one B) many For each civil time standard: III) Locale A) restricted to Earth [projects or users, not necessarily hardware] B) other than Earth [e.g., Martian rovers] B) Solar system scope C) truly Universal IV) Synchronization [with underlying time standard(s)] A) Overloading 1) Single 2) Dual [e.g., UTC is synchronized to both Solar and Atomic scales] 3) Multiple [e.g., Earth+Mars+Atomic] For each fundamental standard: B) Phenomenology 1) Natural s) Solar i) apparent ii) mean iii) standard iv) daylight saving v) Sidereal b) Tidal c) Lunar d) Seasonal e) Planetary i) various 2) Physical a) Atomic b) GPS 3) Dynamical [roughly both] a) various C) Optimization 1) remain within tolerance (e.g., 0.9s) 2) minimize figure of merit (e.g., DUT1) 3) minimize uncertainty in schedule D) Method 1) steps (I'm tired of the word "leap) a) arbitrary size b) fixed size i) millisecond ii) second iii) minute iv) hour v) other 2) rates ("rubber seconds") 3) both E) Adjustments 1) discontinuity 2) time slice (e.g., UTS) F) Triggering 1) manual (e.g., reset a clock by hand) 2) automatic G) Scheduling 1) adaptive as needed 2) sliding 3) fixed in advance H) Sampling 1) continuous 2) daily 3) monthly 4) annually 5) decadal 6) pre century 7) greater than a century 8) arbitrary I) Corrections 1) issued as table 2) issued as formula 3) implicit in method J) Residuals [e.g., DUT1] 1) None 2) Fixed 3) Monotonic 4) Periodic 5) Piecewise 6) Arbitrary K) Notification 1) as needed 2) daily 3) monthly 4) six months 5) annually 6) decade 7) fifty years 8) none neededReceived on Sun Aug 14 2005 - 13:18:53 PDT
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