NLC's can be seen from around mid May to early August during the darkest part of a summer's night when the Sun is between 6 - 16 degrees below the horizon. Typically, they will occupy the northern horizon, along the twilight arch, extending to an altit e of 10 - 15 degrees. Observations of NLC remain of great value to professional scientists studying upper-atmosphere phenomena.
Useful observations are very easy to make and require no special equipment.
Give the latitude and longitude of the place observations were made. Alternatively, give the name of the nearest town or city. Polaris defines the northern point of your horizon. Azimuths can en be gauged by using a clenched fist, held at arms length, as a measure of 10 degrees. If possible, measure the angle subtended by the uppermost part of the display.