↩ 🔵 🔵 🔵 ❪✺_ₜₛ❫ Astronomical Typesets ○ ❪𝛿’❫ Astronomical Coordinates ○ ❪𝛿’❫ Epochs ○ Heliocentric Julian Day (HJD) ○◂ Julian Day (JD) ○◂ Modified Julian Day (MJD) ○◂