  Recently funded satellites will map the cosmic microwave background radiation
with unprecedented sensitivities and angular resolutions. Assuming only
primordial adiabatic scalar and tensor perturbations, we evaluate how
accurately experiments of this type will measure the basic cosmological
parameters $\Omega$ (the total density of the Universe), $\Omega_b$ (the baryon
density), $h$ (the Hubble constant), and $\Lambda$ (the cosmological constant).
The proposed experiments are capable of measuring these parameters at the
few-percent level. We briefly discuss the generality of these estimates and
complications arising in actual data analysis.
