AltitudeOfCelestialBody returns the altitude of the celestial body, given `φ` (the observer latitude), `δ` (the declination) and `H` (the local hour angle).

ApparentObliquityOfTheEcliptic returns the mean obliquity of the ecliptic, corrected for calculating the apparent position of the sun, in degrees, given `t` (julian century) and `ε0` (mean obliquity of the ecliptic).

ApparentSolarLongitude returns apparent longitude of the Sun, referred to as the true equinox of the date, given `t`, the julian century, and `L0`, the mean longitude.

ApproximateTransit returns the approximate transite given L (the longitude), Θ0 (the sidereal time), and α2 (the right ascension).

AscendingLunarNodeLongitude returns the ascending lunar node longitude, given `t`, the julian century,.

CorrectedHourAngle returns the corrected hour angle given m0 (the approximate transit), h0 (the angle), coordinates (the coordinates), afterTransit(whether it's after transit), Θ0 (the sidereal time), α2 (the right ascension), α1 (the previous right ascension), α3 (the next right ascension), δ2 (the declination), δ1 (the previous declination), and δ3 (the next declination).

CorrectedTransit returns the time at which the sun is at its highest point in the sky (in universal time) given m0 (approximate transit), L (the longitude), Θ0 (the sidereal time), α2 (the right ascension), α1 (the previous right ascension) and α3 (the next right ascension).

Degrees converts `radians` to the corresponding degree value.

GetJulianCentury returns the Julian century from epoch, given `julianDay`.

GetJulianDay returns the Julian day for a given Gregorian date.

Interpolate returns the interpolated value given y2 (the value), y1 (the previous value), y3 (the next value) and n (the factor).

InterpolateAngles returns the interpolation of three angles, accounting for angle unwinding, given y2 (the value), y1 (previousValue), y3 (nextValue), and n (factor).

MeanLunarLongitude returns the geometric mean longitude of the moon in degrees, given `t`, the julian century.

MeanObliquityOfTheEcliptic returns the mean obliquity of the ecliptic in degrees, given `t`, the julian century.

MeanSiderealTime returns mean sidereal time, aka the hour angle of the vernal equinox, in degrees, given `t`, the julian century.

MeanSolarAnomaly returns the sun's equation of the center in degrees, given `t`, the julian century, and `m`, the mean anomaly.

MeanSolarLongitude returns the geometric mean longitude of the sun in degrees, given `t`, the julian century.

NutationInLongitude returns the nutation in longitude, given `L0`, the the solar longitude, `Lp`, the lunar longitude and `Ω`, the ascending node.

NutationInObliquity returns the nutation in obliquity, given `L0`, the the solar longitude, `Lp`, the lunar longitude and `Ω`, the ascending node.

Radians converts `degrees` to the corresponding radian value.

SolarEquationOfTheCenter returns the sun's equation of the center in degrees, given `t`, the julian century, and `m`, the mean anomaly.