129809647129273750_280Solar elevation angle defines the solar elevation angle of Sun for short height (in fact, angle) decision height is obtained on the surface of the Earth the Sun's thermal energy of the Sun of a number of the most important factors. We use h to represent the angle, it is numerically equal to the Sun at the altitude of celestial horizontal coordinate system. How to draw a Sun elevation angle when h = 90 °-latitude difference on the ground (Calculating the latitude of the location latitude and direct point of difference of latitude) * the same hemisphere, latitude subtraction, instead add general time solar elevation angle when the local changes and changes in the Sun's declination. Declination of the Sun (and the Sun points equal to the latitude) to δ, observing geographic latitude is represented by φ (geographic latitude and declination of the Sun is North latitude is positive, a negative latitude),Time (hour angle) to t, Sun elevation angle formula: sin h=Sin φ Sin δ COS φ COS δ COS t noon time of sunrise and sunset, and solar elevation angle is changing in the same day. Angles are 0 Sunrise, sunset, noon solar elevation angle when the noon sun elevation angle of the maximum, hour angle0, the above formula can be simplified to: sin h=Sin φ Sin δ COS φ COS δ by the angle sum and difference of two trigonometric formula Sin h=COS (PHI-δ) therefore, for the area north of the Sun is at the Zenith, and h=90 °-(PHI-δ) for Sun is located south of the zenithArea,, h=90 °-(δ-φ); both merged, because regardless of is (φ-δ) also is (δ-φ), are is to seeking local latitude and Sun direct latitude of difference, does not is negative of, so are is equal to it of absolute, so noon sun height angle calculation formula: h=90 °-| φ-δ | specific calculation also is lift a examples to derivation, assumptionsEquinox day (autumnal Equinox day also can, Sun direct points in Equatorial) a Shi midnight sun height angle carved Sun direct (0 °, 120 ° e) this is, 120 ° e warp Shang all points are is noon for (0 °, 120 ° e) this
TERA Gold,, it away from Sun direct points of latitude distance course is 0 ° la (because is themselves why) it of Sun height angle is 90 ° (due toFor direct it why) also a observation points, (1 ° N,120 ° e) and Sun direct points of latitude difference for 1 ° at this time, this is of Sun height angle for 89 ° (under above of formula h=90 °-| φ-δ |) smart of you certainly know, (1 ° S,120 ° e) and Sun direct points of latitude difference is 1 ° so, local of SunHigh point is 89 °
TERA Gold! Same moments, following all observation points
TERA Power Leveling, report of Sun height angle number is as follows: South latitude 2 ° (and Sun direct points apart 2 °): 88 ° (=90 °-2 °) South latitude 3 ° (and Sun direct points apart 3 °): 87 ° (=90 °-3 °) South latitude 10 ° (and Sun direct points apart 10 °): 80° (=90 °-10 °) South latitude 30 ° (and Sun direct points apart 30 °): 60 ° (=90 °-30 °) South latitude 80 ° (and Sun direct points apart 80 °): 10 ° (=90 °-80 °) South latitude 90 ° (and Sun direct points apart 90 °): 0 ° (=90 °-90 °) Sun Red weft of algorithmIn the above equations that relate to the declination of the Sun, and solar declination of the algorithm is as follows: because the Sun declination angle at the annual occurrences of any moment in the sport is known as strict, so it (ED) and can also be used for (1) similar expression, namely: ED=0.3723 23.2567sin θ 0.1149sin2 θ-0.1712sin3 θ -0.758cos θ 0.3656cos 2 θ 0.0201cos3 θ (5) θ said today in an angle, that is, θ = 2 π t/365.2422 (2) t here is made up of two parts, namely t=N-N0 (3)-n is the product of Japan, called product, is the date in year orderSerial number, for example, on January 1 its product is 1, product day common year December 31 as 365, 366 in leap years, and so on. N0=79.6764 0.2422x ( -1985 year)-INT ((year-1985)/4) (INT in an integer part, such as INT (3.25) =3) Sun highDay and night around the terminator on the height of the Sun is 0 °, are going through day and night changes; in the days around the Sun on the dome height greater than 0 °, said the day; in the middle of the ball around the Sun height is less than 0 °, that night. Bid in a schematic diagram of the angle to the Sun elevation angle
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