The length of the Tzitzit must be twelve times the width of the thumb. The measure of the phylacteries must be two fingers by two fingers and necessarily square. It must be sewn so as to retain a square shape. Their diagonals must be those of a square so that all angles be equal. The sukkah is to be at least seven handbreadths, the shofar one handbreadth, the mikvah must contain at least forty se'ahs.
Astronomical time is important for the application of ideal to real.
When the sun goes down and when the sun rises up a new day begins. In a matter of minutes, Sabbath begins or Sabbath leaves. For Soloveitchik the Halachic personality is not a passive personality subject to the bombardment of sensations. God empowers the Halachic man to sanctify the world - God and Halachah marks out Holy and Profane. Soloveitchik mentions a number of instances in which the halachic control of the world includes the inner world of man.