  Several key relations are derived for Cosmological General Relativity which
are used in standard observational cosmology. These include the luminosity
distance, angular size, surface brightness and matter density. These relations
are used to fit type Ia supernova (SNe Ia) data, giving consistent, well
behaved fits over a broad range of redshift $0.1 < z < 2$. The best fit to the
data for the local density parameter is $\Omega_{m} = 0.0401 \pm 0.0199$.
Because $\Omega_{m}$ is within the baryonic budget there is no need for any
dark matter to account for the SNe Ia redshift luminosity data. From this local
density it is determined that the redshift where the universe expansion
transitions from deceleration to acceleration is $z_{t}= 1.095
{}^{+0.264}_{-0.155}$. Because the fitted data covers the range of the
predicted transition redshift $z_{t}$, there is no need for any dark energy to
account for the expansion rate transition. We conclude that the expansion is
now accelerating and that the transition from a closed to an open universe
occurred about $8.54 {\rm Gyr}$ ago.
