The North Star is not permanent If the presence of ... The Earth undergoes a precession like a slowing top on a timescale of 26,000 years. This causes the planet’s axis to conduct a loop on ...

Type II X-ray outbursts are thought to occur when the warped disc interacts with the fast stellar wind. We suggest that tides from a misaligned companion neutron star can cause the observed effects.

known as precession. This means that the star we call Polaris has been the closest visible marker of the celestial North Pole for about less than 4,000 years, and wasn’t all that close for much ...

An analytic solution of a planetary orbit disturbed by the solar gravitational oblateness is derived. In addition to short- and long-periodic disturbances there are secular disturbances, which lead to ...