Meditation starts 20 minutes before sunrise

 Start meditating 20 minutes before sunrise for the morning session and end meditating 20 minutes after sunset for the evening session. Creating a socket of silver means to meditate at night under the light of the silvery moon  

Exodus 26:19 KJV

And thou shalt make forty sockets of silver under the twenty boards; two sockets under one board for his two tenons, and two sockets under another board for his two tenons.