Assembly: ASCOM.Astrometry (in ASCOM.Astrometry.dll) Version: 18.104.22.168 (22.214.171.12419)
- Type: System..::..Double
Current value for Delta-UT1, the difference between UTC and UT1; always in the range -0.9 to +0.9 seconds. Use 0.0 if you do not know this value; it varies irregularly throughout the year.
Return ValueDouble - Julian date on the UT1 timescale.
When Delta-UT1 is provided, UT1 is calculated as UT1 = UTC + DeltaUT1. Otherwise, when Delta-UT1 is 0.0, DeltaUT1 is calculated as DeltaUT1 = TT - DeltaT = UTC + ΔAT + 32.184s - DeltaT, where ΔAT is the current number of leap seconds applied to UTC (34 at April 2012, with the 35th being added at the end of June 2012).
Forecast values of DUT1 are published by IERS Bulletin A at http://maia.usno.navy.mil/ser7/ser7.dat