R. A. Jacobson, V. Lainey (2014) "Martian Satellite Orbits and Ephemerides". Planet. Space Sci. 102:35-44. With the advancement in technology, Ephemeris today is calculated electronically with the help of mathematical models based on the movement of celestial bodies via-a-vis that of the Earth. The printed Planetary Ephemeris, though obsolete, is still in use in some parts of the world where the computers and electronic devices are still not widely used or haven’t been made available to the public at large. Ephemeris meaning in Latin is diary or journal. Since ancient times, the current planetary positions on a given date (Grah position or Grah Stithi) have been assigned printed values in a tabular format. These attributes tend to change from time to time with the change in the trajectory of the celestial bodies. As a result, such a tabular compilation would usually last for a day only to be replaced by new values on the following day. Such a diary was, therefore, termed as Planetary Ephemeris.

calendar Moon Calendar - October 2023 When is the Next Full Moon? Full Moons & New Moons 2023 Eclipses Solar & Lunar 2023 Void of Course Moon 2023 Gardening Moon Calendar Fertility Days (Lunar Conception) An ephemeris (plural: ephemerides) (from the Greek word ephemeros= daily) is a table providing the positions (given in longitude) of the Sun, the Moon, and the planets in the sky along the zodiacal ecliptic at a given moment in time; the positions are usually given for either noon or midnight depending on the particular ephemeris that is used.

R. A. Jacobson (2021) "Ephemerides of the unnamed Saturnian irregulars including the newly discovered S/2019~S1 — SAT450". personal communication to Horizons/NAIF. Reference: M. Brozović, M. R. Showalter, R. A. Jacobson, M. W. Buie (2015) "The orbits and masses of satellites of Pluto". Icarus 246:317-329.

Place the Aries glyph in the first outer-wheel (house #1), Taurus glyph in the second outer-wheel (house #2), and continue using the twelve zodiac glyph signs all the way around. R. A. Jacobson, M. Brozović, N. Mastrodemos, J. E. Riedel, S. S. Sheppard (2022) "Ephemerides of the Irregular Saturnian Satellites from Earth-based Astrometry and Cassini Imaging". AJ 164:240. R. A. Jacobson (2021) "The Orbits of the Regular Jovian Satellites and the Orientation of the Pole of Jupiter". personal communication to Horizons/NAIF. R. A. Jacobson (2014) "Update of the irregular Uranian satellite orbits with data through 2013 — URA112". personal communication to Horizons/NAIF. R. A. Jacobson (2014) "The Orbits of the Uranian Satellites and Rings, the Gravity Field of the Uranian System, and the Orientation of the Pole of Uranus". AJ 148:76-88.M. Brozović (2020) "Update of the inner Neptunian satellite orbits — NEP097". personal communication to Horizons/NAIF. R. Jacobson, M. Brozović, B. Gladman, M. Alexandersen, P. D. Nicholson, Veillet (2012) "Irregular satellites of the outer planets: orbital uncertainties and astrometric recoveries in 2009--2011". AJ 144:132. M. Brozović, R. A. Jacobson (2019) "The Orbits of the inner satellites of Uranus: solution URA115". Interoffice Memo. 392R-19-007 (internal document).

A scientific Ephemeris shows planetary positions’ current overview using the spherical polar coordinate system, a system used by mathematicians and physicians on a variety of applications to plot the trajectory of a moving body. The current planetary positions are then used in preparing maps of stars in the sky, and telescopes. In astronomy, it finds use in determining the movement and the centre of the planets, stars and galaxies. M. Brozović, R. A. Jacobson, S. S. Sheppard (2011) "The Orbits of the Outer Neptunian Satellites". AJ 141:135.

R. A. Jacobson (2019) "Ephemerides of the unnamed Saturnian irregulars including the 20 newly discovered ones — SAT428". personal communication to Horizons/NAIF. R. A. Jacobson, M. Brozovic, M. Showalter, A. Verbiscer, M. Buie, P. Helfenstein (2019) "The Orbits and Masses of Pluto's Satellites". In Pluto System After New Horizons 2133:7031. M. Brozović (2021) "Update of the inner Neptunian satellite orbits — NEP100". personal communication to Horizons/NAIF. It also provides data on astronomical phenomena of interest to astrologers and astronomers such as solar and lunar eclipses, apparent retrogradation/planetary stations, planetary ingresses, sidereal time, positions for the Mean and True nodes of the moon, the phases of the Moon, and sometimes even the position(s) of Chiron, Lilith, and other obscure celestial bodies; many ephemerides also contain a monthly aspectarian, while others often include the declination of the planets as well. R. A. Jacobson (2020) "The Orbits of the Regular Jovian Satellites, the Trajectories of Spacecraft at Jupiter, the Gravity Field of the Jovian System, and the Orientation of the Pole of Jupiter". Interoffice Memo. 392R-20-006 (internal document).