Astronomy and Mathematics. The angle, arc, or other mathematical quantity, from which another required quantity may be deduced, or on which its…

In plural. Mathematics. Fractions expressed in terms of sixtieths; sexagesimal fractions. Obsolete.

spec. (plural) Astronomy. The data necessary to determine the orbit of a heavenly body.

Astronomy. Each of a set of numerical quantities, typically six, that jointly specify the orbit of a planet, comet, or other body; = element, n. 7a…

a function expressing the potential of the factors which cause perturbation, esp. (Astronomy) in the motion of a celestial object.

a function giving the number or proportion of heavenly bodies with an absolute magnitude equal to, or greater than, any chosen value.

Used in the possessive and attributively to designate concepts arising out of E. P. Hubble's work, as Hubble constant n. or Hubble factor, Hubble'…

either of two constants occurring in a pair of equations relating the radial and tangential velocities of a star in the Galaxy to its distance…