equation of time

equation of time:

see solar timesolar time,
time defined by the position of the sun. The solar day is the time it takes for the sun to return to the same meridian in the sky. Local solar time is measured by a sundial.
..... Click the link for more information. .

equation of time

The correction that must be applied to apparent solar time to obtain mean solar time, i.e. it is the difference in time as measured by a sundial and by a clock. The equation of time varies through the year; it has two maxima and two minima and is zero on four dates: April 15/16, June 14/15, Sept. 1/2, and Dec. 25/26. A positive value indicates that apparent time is ahead of mean time; the greatest positive value, which can be over 16 minutes, occurs in early Nov.; the greatest negative value, over 14 minutes, occurs in mid-Feb. The curve is the sum of two components, each reflecting a nonuniformity in the apparent motion of the Sun: one component arises from the ellipticity of the Earth's orbit, the other from the inclination of the ecliptic to the celestial equator (see mean Sun).

Equation of Time

the difference between mean solar time and apparent solar time, equal to the difference between the right ascensions of the true sun and the mean sun. The equation of time is often defined as the difference between apparent time and mean time; in this case, the equation has the opposite sign, a fact that must be borne in mind when reference books are used.

The equation of time varies continuously. The variation is due to the fact that the passage of apparent solar time, as measured by the hour angle of the true sun, is nonuniform because of the nonuniformity of the earth’s orbital motion and the inclination of the ecliptic to the equator. Therefore, the equation of time is obtained by adding two waves of approximately sinusoidal shape and nearly equal amplitude (see Figure 1). One of the waves has an annual period; the other, a semiannual period. The equation of time is equal to zero four times a year—around Apr. 16, June 14, Sept. 1, and Dec. 25. Four times a year it attains the following largest absolute values: +14.3 min (around Feb. 12), –3.8 min (around May 15), +6.4 min (around July 27), and –16.4 min (around Nov. 4).

Figure 1. Plot of the equation of time: (1) component of the equation determined by the nonuniformity of the earth’s orbital motion, (2) component of the equation determined by the Inclination of the ecliptic to the equator, (3) the equation of time

We can find the local mean solar time by using the equation of time if we know the apparent solar time, as determined from observations of the sun with, for example, a sundial. In this case, we use the following formula:

m = m₀ + η

where m is the mean time, m₀ is the apparent time, and η in is the equation of time.

Values of the equation of time for each day are given in astronomical almanacs and calendars. (See.)

equation of time

[i′kwā·zhən əv ′tīm] (astronomy) The addition of a quantity to mean solar time to obtain apparent solar time; formerly, when apparent solar time was in common use, the opposite convention was used; apparent solar time has annual variation as a result of the sun's inclination in the ecliptic and the eccentricity of the earth's elliptical orbit.

equation of time

The amount of time by which the mean sun leads or lags behind the true sun at any instant. Its value is positive or negative, depending on whether the true sun is ahead of or behind the mean sun. Its value never exceeds 16¼ min. It is the correction applied to 12 h + local mean time to obtain the local hour angle of the sun.

单词	equation of time
释义	equation of time equation of time n. The difference between time measured from the observed position of the sun and time measured from the position of the mean sun, caused by changes in the earth's orbital speed through the cycle of the seasons. It is the difference between time measured with a sundial and time measured with a clock. equation of time n (Horology) the difference between apparent solar time and mean solar time, being at a maximum in February (over 14 minutes) and November (over 16 minutes) equa′tion of time′ n. apparent time minus mean solar time, ranging from minus 14 minutes in February to over 16 minutes in November. Translations equazione del tempo equation of time equation of time: see solar timesolar time, time defined by the position of the sun. The solar day is the time it takes for the sun to return to the same meridian in the sky. Local solar time is measured by a sundial. ..... Click the link for more information. . equation of time The correction that must be applied to apparent solar time to obtain mean solar time, i.e. it is the difference in time as measured by a sundial and by a clock. The equation of time varies through the year; it has two maxima and two minima and is zero on four dates: April 15/16, June 14/15, Sept. 1/2, and Dec. 25/26. A positive value indicates that apparent time is ahead of mean time; the greatest positive value, which can be over 16 minutes, occurs in early Nov.; the greatest negative value, over 14 minutes, occurs in mid-Feb. The curve is the sum of two components, each reflecting a nonuniformity in the apparent motion of the Sun: one component arises from the ellipticity of the Earth's orbit, the other from the inclination of the ecliptic to the celestial equator (see mean Sun). Equation of Time the difference between mean solar time and apparent solar time, equal to the difference between the right ascensions of the true sun and the mean sun. The equation of time is often defined as the difference between apparent time and mean time; in this case, the equation has the opposite sign, a fact that must be borne in mind when reference books are used. The equation of time varies continuously. The variation is due to the fact that the passage of apparent solar time, as measured by the hour angle of the true sun, is nonuniform because of the nonuniformity of the earth’s orbital motion and the inclination of the ecliptic to the equator. Therefore, the equation of time is obtained by adding two waves of approximately sinusoidal shape and nearly equal amplitude (see Figure 1). One of the waves has an annual period; the other, a semiannual period. The equation of time is equal to zero four times a year—around Apr. 16, June 14, Sept. 1, and Dec. 25. Four times a year it attains the following largest absolute values: +14.3 min (around Feb. 12), –3.8 min (around May 15), +6.4 min (around July 27), and –16.4 min (around Nov. 4). Figure 1. Plot of the equation of time: (1) component of the equation determined by the nonuniformity of the earth’s orbital motion, (2) component of the equation determined by the Inclination of the ecliptic to the equator, (3) the equation of time We can find the local mean solar time by using the equation of time if we know the apparent solar time, as determined from observations of the sun with, for example, a sundial. In this case, we use the following formula: m = m₀ + η where m is the mean time, m₀ is the apparent time, and η in is the equation of time. Values of the equation of time for each day are given in astronomical almanacs and calendars. (See.) equation of time [i′kwā·zhən əv ′tīm] (astronomy) The addition of a quantity to mean solar time to obtain apparent solar time; formerly, when apparent solar time was in common use, the opposite convention was used; apparent solar time has annual variation as a result of the sun's inclination in the ecliptic and the eccentricity of the earth's elliptical orbit. equation of time The amount of time by which the mean sun leads or lags behind the true sun at any instant. Its value is positive or negative, depending on whether the true sun is ahead of or behind the mean sun. Its value never exceeds 16¼ min. It is the correction applied to 12 h + local mean time to obtain the local hour angle of the sun. AcronymsSeeEOT
随便看	motherfucking mother general mother glass mother goddess mother-goddess mother goddesses mother goddess gnostic society mother goose mother goose asks why mother goose meets mother nature mother goose special school system, inc mother goose tales mother hairs mother hen mother hens motherhood motherhood and apple pie motherhoods mother house motherhouse mother houses mother hubbard mother hubbard clause mother hubbards mother i'd like to find

equation of time

equation of time

equation of time

equa′tion of time′

equation of time

equation of time:

equation of time

Equation of Time

equation of time

equation of time