/**
* Calculate the UTC of evening astronomical twilight for the given day at the given latitude and
* longitude on Earth
*
* @param julian Julian day
* @param ll latitude and longitude of observer in degrees
* @param timeZone the timeZone to use (e.g. Sun.GMT or Sun.PST)
* @param dst true if daylight savings time (summer time) should be taken into account
* @return time in minutes from zero Z
*/
public static Time eveningAstronomicalTwilightTime(
double julian, LatitudeLongitude ll, TimeZone timeZone, boolean dst) {
double timeMins =
eveningPhenomenon(
julian, ll.getLatitude(), -ll.getLongitude(), ASTRONOMICAL_TWILIGHT_ZENITH_DISTANCE)
+ (timeZone.getRawOffset() / 60000.0);
if (dst) timeMins += 60.0;
return convertTime(timeMins);
}
/**
* Calculate the UTC of sunrise for the given day at the given latitude and longitude on Earth
*
* @param julian Julian day
* @param ll latitude and longitude of observer in degrees
* @param timeZone the timeZone to use (e.g. Sun.GMT or Sun.PST)
* @param dst true if daylight savings time (summer time) should be taken into account
* @return time in minutes from zero Z
*/
public static Time sunriseTime(
double julian, LatitudeLongitude ll, TimeZone timeZone, boolean dst) {
double timeMins =
morningPhenomenon(
julian, ll.getLatitude(), -ll.getLongitude(), SUNRISE_SUNSET_ZENITH_DISTANCE)
+ (timeZone.getRawOffset() / 60000.0);
if (dst) timeMins += 60.0;
return convertTime(timeMins);
}
/**
* Calculate the UTC of morning civil twilight for the given day at the given latitude and
* longitude on Earth
*
* @param julian Julian day
* @param ll latitude and longitude of observer in degrees
* @param timeZone the timeZone to use (e.g. Sun.GMT or Sun.PST)
* @param dst true if daylight savings time (summer time) should be taken into account
* @return time in minutes from zero Z
*/
public static Time morningCivilTwilightTime(
double julian, LatitudeLongitude ll, TimeZone timeZone, boolean dst) {
double timeMins =
morningPhenomenon(
julian, ll.getLatitude(), -ll.getLongitude(), CIVIL_TWILIGHT_ZENITH_DISTANCE)
+ (timeZone.getRawOffset() / 60000.0);
if (dst) timeMins += 60.0;
return convertTime(timeMins);
}
