The calculated distance (air line) between Rozhdestveno and Krasnyy Yar is approximately 23 miles respectively 37 kilometers.
By car or train, the actual journey to Krasnyy Yar is certainly longer, as only the direct route (as the crow flies) between Rozhdestveno and Krasnyy Yar has been calculated here.
Air line (approximately)
37 kilometers
20 nautical miles