A note on sunrise, sunset and twilight timesபரணிடப்பட்டது 2013-07-01 at the வந்தவழி இயந்திரம் from HM Nautical Almanac Office, The United Kingdom Hydrographic Office. Quoting:
There is no general agreement on a precise definition of "dawn"; it is sometimes even identified with sunrise itself. If, however, it is interpreted as the time of "first light", dawn corresponds to a depression between 18° and 12° but it is not possible to be more precise'.
A note on sunrise, sunset and twilight timesபரணிடப்பட்டது 2013-07-01 at the வந்தவழி இயந்திரம் from HM Nautical Almanac Office, The United Kingdom Hydrographic Office. Quoting:
There is no general agreement on a precise definition of "dawn"; it is sometimes even identified with sunrise itself. If, however, it is interpreted as the time of "first light", dawn corresponds to a depression between 18° and 12° but it is not possible to be more precise'.
