Ephemeris day

An ephemeris day is a period of 86 400 SI seconds. The actual length of a solar day varies, and has a tendency to get longer as the tides slow the earth down (see Tidal acceleration). In the Système International (SI), the length of day during the late 19th century was used to define the second. (See ΔT.) In recent decades, the length of a solar day has usually been a couple milliseconds more than an ephemeris day.

单词	Ephemeris day
释义	Ephemeris day 英语百科 Ephemeris day An ephemeris day is a period of 86 400 SI seconds. The actual length of a solar day varies, and has a tendency to get longer as the tides slow the earth down (see Tidal acceleration). In the Système International (SI), the length of day during the late 19th century was used to define the second. (See ΔT.) In recent decades, the length of a solar day has usually been a couple milliseconds more than an ephemeris day.
随便看	additive feeder的意思 additive file attribute的意思 additive filter的意思 additive flameretardant的意思 additive flame retardant的意思 Additive,Food的意思 additive for acidizing fluid的意思 additive for adhesive的意思 additive for beer的意思 additive for cement slurry的意思 additive for clean burning of briquette的意思 additive for coal blending的意思 additive for combustion的意思 additive for drilling fluid的意思 additive for fracturing fluid的意思 additive for gasoline的意思 additive for lubricating grease的意思 additive for lubricating oil的意思 additive formula的意思 additive for sulfur capture的意思 additive frame counter的意思 Additive function的意思 additive functional的意思 additive functional transformation的意思 additive functions的意思