Pandit Śrīram Sharma Acharya in a Sadhana Camp described the practical aspect of Savita Dhyan. In his words: Mental concentration on some gross objects e.g. the rising Sun, is most convenient for majority of people; because, the human mind, in general, is not so developed that it could be focused for a stretch without any visible or perceptible symbol. However with sincere practice, one begins to realize the presence of spirit in his inner self and learn to meditate upon it.
How to practice it? Select a well ventilated calm and clean place for the practice. It will be more effective if the timing is of sunrise. Sit in padmasana, Siddhasana or Sukhasana (simple cross legged) with the spine erect and body parts relaxed. After the body part awareness observe the natural flow of breath. Slowly bring the awareness at center of brain and try to visualize the light spot of rising Sun.