Video: Time
Calculating Besselian Epoch
This lesson will show how to convert image dates to Besselian, which is the recognized standard for Double Star research.
What is Time: BJD
Barycentric Julian Day (BJD) time is the universal day and time at the center of the solar system and is crucial to many astronomically-relevant processes as well as other time scales.
What is an Ephemeris
A highly useful concept for applications in both Double and Variable Stars, an Ephemeris is an estimation of where/when a particular astronomical event will occur at a particular time in the future.
What is Time from an Astronomical Perspective
This video outlines some of the most commonly encountered time scales of the many used in Astronomy.
What is Time: HJD
Heliocentric Julian Date (HJD) is the Julian Date corrected for the differences in the Earth’s position relative to the center of the Sun.
What is Time: JD
Julian Dates (JD) are a continuous count of days, and fractions of days, since noon Universal Time on January 1, 4713 BC (on the Julian calendar)
What is an Epoch
An epoch is a particular time period, point in history, or a moment defined by a particular event, and is a moment of time used as a reference point for a time-varying astronomical quantity.