About the sunset meditation exercise: The practice itself does not depend on whether the sun is actually shining at the time. For Nature comes to a great but brief pause just then. This cessation of inner activity takes place whatever the outer physical conditions are. It can be felt by sensitive persons. Therefore the meditation need not be abandoned if outer conditions seem undesirable, although the beautiful colouring of the skies when sunshine is present helps those who have aesthetic feeling.
-- Notebooks Category 3: Relax and Retreat > Chapter 7: Sunset Contemplation > # 27