Surya Namaskar, Salute to the Sun or Sun Salutation, is a practice in yoga as exercise incorporating a sequence of some twelve gracefully linked asanas. The asana sequence originated in the Hatha Yoga tradition on 9th century in India.
Sun Salutations also are a great way to energize the body in the morning to start the day. The lungs, digestive system, as well as muscles and joints will all benefit from practicing Sun Salutations. This practice also increases the vital energy of pranayama (breathing) in your body, which helps remove blocked energy.
It is a good idea to do at least 12 rounds of Surya Namaskars daily. However, as a beginner to this yoga practice, you could start with two to four rounds and then gradually go up to as many as you can comfortably do (even up to 108 if you can!).
Even though they are often used to energize and warm the body, they can be practiced in a way that relaxes and recharges the body instead of raising energy. The 12-position Sun Salutation (Surya Namaskar C), is a wonderful evening flow sequence too. … So my answer is yes, its fine to practice Sun Salutations in the evening.
Practicing yoga at any time of the day is perfectly fine. No wonder, you can reap the maximum benefits in early morning but yoga at night will not create any problem for you. It is really important to understand what yoga actually does to your body. Yoga only helps you relax your mind and body.