Solstices happen twice a year - once around June 21 and then again around December 21.
Other GPS-enabled smartphones do not have the same function, they said.
The stars trace out arcs of constant declination, the sky equivalent of latitude.
Bright Polaris, the North Star, lies within 1° of the north celestial pole — where Earth's axis intersects the celestial sphere.
In 2017, the December Solstice is on December 21, at UTC.
Due to the Time Zone difference, some locations will have their solstice on a different date.