"Ahoratrasya Ya Sandhih Suryanaksatra Varjita |
Satu Sandhya Samakhyata Munibhistatva Darsibhih||"
Meaning: Around the times of sunrise and sunset when neither sun nor any of the stars are seen even in the clear sky.) These time intervals (sandhya-times) are described as extremely sensitive with respect to the effect on bodily, mental and spiritual wellbeing. We should be very careful about what we do in this period. As per the Ayurvedic treatise "Sahityika Subhashita Vaidyakam"