equatorialToHorizontal function

HorizontalPosition equatorialToHorizontal(
  1. double rightAscension,
  2. double declination,
  3. Observer observer,
  4. double jdTT, {
  5. bool withRefraction = false,
  6. double pressure = 1010,
  7. double temperature = 10,
  8. double? deltaTSeconds,
})

Horizontal coordinates of a direction given by apparent right ascension and declination of date (rightAscension, declination, degrees; true equator and equinox of date) for observer at jdTT. No parallax – for stars, galaxies and other distant objects.

For catalogue (ICRS/J2000) coordinates create a FixedStar and use fixedStarHorizontal, which also applies precession, nutation and aberration.

Implementation

HorizontalPosition equatorialToHorizontal(
  double rightAscension,
  double declination,
  Observer observer,
  double jdTT, {
  bool withRefraction = false,
  double pressure = 1010,
  double temperature = 10,
  double? deltaTSeconds,
}) => _horizontal(
  rightAscension,
  declination,
  double.infinity,
  observer,
  jdTT,
  withRefraction,
  pressure,
  temperature,
  deltaTSeconds,
);