Time Time::GetPrevSunRise

(

double

horizon

)

const

Returns

The time of the previous sun-rise, relative to given horizon in degree, for the coordinates of the ORM, La Palma. if libnova was not compiled in, it will return the next noon.

Exceptions

a	runtime_error exception is thrown if the calculation of the sun-rise by libnova fails (this would happen if libnova thinks the sun is circumpolar which should never happen at La Palma)

Definition at line 313 of file Time.cc.

References JD(), Mjd(), Nova::ORM(), and Time().

Referenced by EventBuilderWrapper::InitRunNumber().

{
#ifdef HAVE_LIBNOVA
    Nova::LnLatPosn obs = Nova::ORM();

    ln_rst_time sun_day;
    if (ln_get_solar_rst_horizon(JD()-0.5, &obs, horizon, &sun_day)==1)
        throw runtime_error("ln_get_solar_rst_horizon reported the sun to be circumpolar at the coordinates of La Palma!");

    if (Time(sun_day.rise)<*this)
        return Time(sun_day.rise);

    if (ln_get_solar_rst_horizon(JD()-1.5, &obs, horizon, &sun_day)==1)
        throw runtime_error("ln_get_solar_rst_horizon reported the sun to be circumpolar at the coordinates of La Palma!");

    return Time(sun_day.rise);
#else
    return Time(floor(Mjd()-0.5)+0.5);
#endif
}

Here is the call graph for this function:

Here is the caller graph for this function: