orbitual

[I]t will now be found that we are within the reach of a link of the chain which connects the principles of the solar and sidereal motions with those that are the cause of orbitual ones.

1806 February 27, William Herschel, “On the Quantity and Velocity of the Solar Motion”, in Philosophical Transactions, of the Royal Society of London. […], part I, London: […] W. Bulmer and Co. […] and sold by G. and W. Nicol, […], →ISSN, →OCLC, page 236

Having learned to attribute an orbitual motion to the earth, it loses this advantage, which is transferred to the sun, as the fixed centre about which its orbit is performed.

1833, John F[rederick] W[illiam] Herschel, “Of the Sun’s Motion”, in A Treatise on Astronomy (The Cabinet Cyclopædia), London: […] Longman, Rees, Orme, Brown, Green & Longman, […] and John Taylor, […], →OCLC, page 199

These forces are in the direction of the moon’s orbitual motion, and therefore her linear velocity is augmented.

1878 December 19, “‘On the Precession of a Viscous Spheroid, and on the Remote History of the Earth.’ By George H[oward] Darwin, […]. Communicated by J[ames] W[hitbread] L[ee] Glaisher, […]”, in Proceedings of the Royal Society of London. […], volume XXVIII, London: Harrison and Sons, […], published 1879, →ISSN, →OCLC, page 187