/**
* @covers Marando\AstroDate\AstroDate::sidereal
*/
public function testSidereal()
{
$tests = [[1.7541749718700912, AstroDate::mjd(53736.0, TimeScale::UT1())->sidereal('m'), 1.0E-9], [1.754166137675019, AstroDate::mjd(53736.0, TimeScale::UT1())->sidereal('a'), 1.0E-8], [1.7541749718700912 + deg2rad(-20), AstroDate::mjd(53736.0, TimeScale::UT1())->sidereal('m', Angle::deg(-20)), 1.0E-9], [1.754166137675019 + deg2rad(-20), AstroDate::mjd(53736.0, TimeScale::UT1())->sidereal('a', Angle::deg(-20)), 1.0E-8]];
foreach ($tests as $t) {
$expt = $t[0];
$st = $t[1];
$this->assertEquals($expt, Angle::time($st)->rad, null, $t[2]);
}
}
/**
* Converts this instance to Universal Time (UT1)
* @return static
*/
public function toUT1()
{
if ($this->timescale == TimeScale::UT1()) {
return $this;
}
$this->toUTC();
$utc1 = $this->jd;
$utc2 = $this->dayFrac;
$dut1 = IERS::jd($utc1 + $utc2)->dut1();
IAU::Utcut1($utc1, $utc2, $dut1, $ut11, $ut12);
$this->jd = $ut11;
$this->dayFrac = $ut12;
$this->timescale = TimeScale::UT1();
return $this;
}
