Mesoamerican astronomy included a broad understanding of the cycles of planets and other celestial bodies. The concept is applicable to other planets and celestial bodies. Earth X is one of a number of planets implanted with a gestating Celestial egg. Aquila is a constellation on the celestial equator. Stars were then regarded as living celestial beings. Ancient China had a long tradition of observing celestial phenomena. Tidal forces are periodic variations in gravitational attraction exerted by celestial bodies. Atmospheric refraction is considered in measuring the position of both celestial and terrestrial objects. Anaximander deduced that eclipses happen because of apertures in rings of celestial fire. It is north of the celestial equator. An observatory is a location used for observing terrestrial or celestial events. In 1809 Carl Friedrich Gauss published his method of calculating the orbits of celestial bodies. Specialized tables were published for applications such as astronomy, celestial navigation and statistics. The ECI frame is also useful for specifying the direction toward celestial objects. A general of the Celestial Lord's Army.