Heydar Aliyev International Airport lies in the temperate mid-latitudes at 40.47° N, 50.05° E, on Asia/Baku time (UTC+4).
Heydar Aliyev International Airport has 2 runways. The longest, 16/34, measures 13,123 ft by 197 ft, which puts the field in the full-length intercontinental category: a fully loaded Boeing 777 or Airbus A350 can depart for the far side of the world. Surfaces vary across the field (asphalt, concrete). Both are lit for night operations.
Runway 16/34 is aligned roughly south/north, which is the clearest hint you get about the prevailing wind here: runways are built to face the wind that blows most often, because aircraft take off and land into it. With 2 runways across 2 different headings, crews can pick whichever best suits the wind.
The runways are not interchangeable. 17/35 is 10,499 ft against 16/34's 13,123 ft, a difference of 2,624 ft, so the shorter one generally takes regional traffic while the longer handles anything heavy.
At 10 ft the field is effectively at sea level, which is the friendliest case for aircraft performance: maximum lift, maximum thrust and the shortest takeoff runs an aircraft is capable of.