41. This ideal mean solar time has been used ever since then to describe the motions of the planets, Moon, and Sun. 42. Two types of solar time are apparent solar time ( sundial time ) and mean solar time ( clock time ). 43. Times in the Almanac were in apparent solar time , because time aboard ship was most often determined by observing the Sun. 44. Two types of solar time are apparent solar time ( sundial time ) and mean solar time ( clock time ). 45. The clock time in this zone is based on mean solar time at the 135th meridian west of the Greenwich Observatory. 46. UTC represents the mean solar time at the meridian, which is kept by the Bureau International des Poids et Mesures in France. 47. Secondly, the solar time must be corrected for the longitude of the sundial relative to the longitude of the official time zone. 48. The westernmost point in Norway proper is on 4?92 E longitude, meaning 42 minutes difference between mean solar time and official time. 49. An analemma may be added to many types of sundials to correct apparent solar time to mean solar time or another standard time. 50. An analemma may be added to many types of sundials to correct apparent solar time to mean solar time or another standard time.
