They're caused by a combination of Earth's orbit and its axial tilt. Every six months, once in March and again in September, an equinox splits Earth’s day almost in half, giving us about 12 ...

and the shape of Earth's orbit around the Sun – in glacial transitions. They also establish a predictive model for past and future glacial cycles based solely on orbital forcing. The Quaternary ...

Starlink satellites orbit approximately 342 miles (550 kilometers) above Earth and put on a spectacular show for observers as they move across the sky. This show is not welcomed by all and can ...