Earth tide Earth tide Earth tide (also known as solid Earth tide, crustal tide, body tide, bodily tide or land tide) is the displacement of the solid earth's surface caused by the gravity of the Moon and Sun. Its main component has meter-level amplitude at periods of about 12 hours and longer. The largest body tide constituents are semi-diurnal, but there are also significant diurnal, semi-annual, and fortnightly contributions. Though the gravitational forcing causing earth tides and ocean tides is the same, the responses are quite different. The larger of the periodic gravitational forces is from the Moon but that of the
Union of the Sun and Moon Union of the Sun and Moon The Union of the Sun and Moon () is one of the Seventeen tantras of the esoteric instruction cycle () which are a suite of tantras known variously as: Nyingtik, Upadesha or Menngagde within Dzogchen discourse. "This tantra shows which experience a person undergoes in the intermediate state, the bardo, after passing away. It teaches how to resolve one's master's oral instructions during the bardo of this life, how to stabilize awareness during the bardo of dying, how to attain enlightenment through recognizing awareness during the bardo of dharmata, and, if necessary, how to