Indeed, and for those without access to Her Majesty's Stationery ;) the current convention is (Apparent Solar Time - Mean Solar Time) often abbreviated TA-TM.
Luke Krzysztof Kotynia wrote: > There is a convention about the sign of the eqt. > It was adopted by IAU (International Astronomical Union) > in 1930. The astronomers treated the eqt. as the instrumental > correction to obtain true time from mean time indicated > by clocks (i.e. measured by instruments). > See eg. Explanatory Supplement to the Astronomical Ephemeris, > Her Majesty's Stationery Office, London 1961, p. 890. > > Best regards > Krzysztof Kotynia (51.8 N, 19.4E)
