The precise alignment of the Local Group's motion through the Cosmic Microwave Background and the net optical flux determined from galaxy catalogs is emphasized. Using Peebles' formula, the ratio of the optical dipole to the rate of incresse of the optical monopole is used to determine Ω directly on the scale of 1 per cent of the Hubble radius. Allowance is made for unobserved galaxies in all major galaxy associations out to at least 10 000 km s−1. We use Huchra's catalog of radial velocities (ZACT Redshift Catalogue, 1987, privately circulated) to demonstrate that the sources of the optical flux dipole are nearer than 3500 km s−1. The Centaurus Concentration at ∼ 4300 km s−1 is not the cause of the Local Group's motion; however, it contributes, and the long axis of the light quadrupole points to it.
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Lynden–Bell et al. (1989) studied this question.