In cosmology, the angular size is defined by
where l is the length of the object. In the Einstein-de Sitter cosmological model, Let a be the expansion parameter,
the critical density parameter,H the Hubble constant,and z the gravitational redshift. Then
The minimum is at
(1)
where l is the length of the object. In the Einstein-de Sitter cosmological model, Let a be the expansion parameter,
the critical density parameter,H the Hubble constant,and z the gravitational redshift. Then(2)
The minimum is at
(3)
(4)
(5)
(6)
(7)
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