# Appendix I — Table of Acronyms, Terms and Constants

TYCHOS = the term I chose for my cosmic model which, of course, is heavily inspired by Tycho Brahe’s model. The final “S” stands for my first name, Simon — since I humbly consider to have completed Brahe’s work.

Tychosium : the interactive planetarium developed by myself and IT-programmer Patrik Holmqvist.

The PVP orbit = The Polaris-Vega-Polaris orbit of the Earth = 113,230.656km in Ø — and 355,724,597 km in circumference

The PVP constant: the percentage-ratio of Earth’s orbital speed in relation to the Sun’s orbital speed : 0.00149326 %.
(The Sun travels at 107,226km/h — whereas Earth travels, in the opposed direction, at 1.601169 km/h.)

TGY = TYCHOS Great Year = 25,344 years = the full time period for the Earth to complete one PVP orbit

ACP = Annual Constant of Precession = 51.1363 arcseconds. This is the TYCHOS-computed, true angular amount by which the stars are drifting (Eastwards in relation to the Sun) each year, as a consequence of Earth’s 1-mph-motion around its PVP orbit.

TMSP = our Moon’s True Mean Synodic Period = 29.22 days. This is the TYCHOS-computed, true (average) synodic period of our Moon.

moon: in lower-case, a satellite of a planet; otherwise capitalized “Moon” being the satellite of Earth.

AU = Astronomical Unit = Average Earth-Sun distance = 149,597,870.7 km (or roughly 149.6 Mkm)

RA = Right Ascension : the celestial equivalent (used in astronomy) of terrestrial longitude. Wikipedia on “Right ascension”

DECL = Declination : the celestial equivalent (used in astronomy) of terrestrial latitude. Wikipedia on “Declination”

360° = 1,296,000 arcseconds = 1,440 minutes (our celestial sphere) = 24 hours = 100% of 1 circle or revolution. The sky can be divided into a number of degrees, arcseconds, minutes or hours of RA. It can sometimes get confusing — but that’s astronomy for you!

Sidereal period: a celestial body completes a “sidereal” period each time it aligns again with a given star.

Synodic period: a celestial body completes a “synodic” period each time it aligns again with the Sun.

Perigee: closest transit point of a body with respect to Earth

Apogee: furthest transit point of a body with respect to Earth

Perihelion: closest transit point of a body with respect to the Sun
Aphelion: furthest transit point of a body with respect to the Sun

Inferior conjunction: when a body (e.g. Venus) is aligned with the Sun while transiting closest to Earth

Superior conjunction: when a body (e.g. Venus) is aligned with the Sun while transiting furthest from Earth

Prograde: a celestial body is said to be “in prograde mode” when it moves in the same direction as the Sun.

Retrograde: a celestial body is said to be “in retrograde mode” when it moves in the opposed direction of the Sun.

Precession: “precession” is just a fancy word for “drift”: in astronomy, a celestial body is said to be “precessing” whenever it is observed to drift over time in relation to other celestial bodies. In the TYCHOS, the stars “precess” over time (in relation to our ‘time-keeper’, the Sun) as a consequence of Earth’s 1-mph-motion. This stellar drift is known as the “equinoctial precession”, since the stars are observed to slowly drift (Eastwards) in relation to our terrestrial equinoxes.