Eras

0.0 (before 2.4 billion BCE)

Pre-Pylistroph

1.0 (c. 2.4 billion BCE)

The Pylistroph

2.0 (c. 1.2 billion BCE)

Flight of the Daamin & Schism of the Hlutr. Nephestal founded.
2.1 (c. 600 million BCE)
Empire of the Iaranori
2.2 (c. 22 million BCE)
Virgo Wars
2.4 (c. 5.2 million BCE)
Avethellan Empire
2.6 (c. 1.63 million BCE)
Dorascan Empire
2.8 (c. 900,000 BCE)
Marpethtal Empire
2.9 (c. 800,000 BCE)
Empire of the Miethara

3.0 (c. 100,000 BCE)

Pre-Imperial Terra
3.75 Dance for the Ivory Madonna
3.962 "Gamester"
3.958 "Big Improvement"

4.0 (2153 CE/TE 0/12,153 HE)

5.0 (2624 CE/TE 471/12,624 HE)

Interregnum
5.38 A Rose From Old Terra

6.0 (2488 CE/12,488 HE)

New Continuum
6.55 "The Geas Ingenerate"

7.0 (10,274 CE/20,274 HE)

Second Terran Empire

8.0 (10,356 CE/24,356 HE)

Post-Imperial Humanity
8.5 The Leaves of October

9.0 (c. 3 million HE)

Endtime

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HR 4523

Primary of Rangi.

HR 4523 (66 G. Centauri) is a binary star system that is located in the northeastern part of the Centaurus constellation, at a distance of about 30.07 ly (9.22 pc) from the Solar System. The larger member of the system is a G-type star that is smaller than the Sun but of similar mass. It has a common proper motion companion that was discovered by W. J. Luyten in 1960. This M-type star appears to be in a wide orbit around the primary at a current separation of about 211 Astronomical Units (A.U.), (or 211 times the separation of the Earth from the Sun). By comparison, Neptune orbits at an average distance of 30 A.U.

The stellar classification for the primary star in this system is G2V the same as the Sun. That of the red dwarf companion is M4V. The primary star has an estimated 86% to 89% the mass of the Sun, 96% of the Sun's radius, and 85% of the Sun's luminosity. It is a slow rotator, with a projected rotational velocity of 0.5 km/s. Age estimates range from 4.5–5.7 Gyr up to 7.1 Gyr or 9.48 Gyr. Compared to the Sun, it only has about 52% of the abundance of elements other than hydrogen and helium; what astronomers term the metallicity of a star.

This star system has a relatively large proper motion. The HR 4523 system is a member of the Epsilon Indi Moving Group, although it is most likely an interloper. (The star is older and has a different composition than the other group members.) It has space velocity components [U, V, W] = [−67, −40, +4] km/s.

The primary star is believed to be orbited by a Neptune-like planet with a mass 16 times that of the Earth. The orbital period of this planet is 122.1 days.

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HR 4523