Exact compliance with this condition is indispensable.

If this condition is not complied with, and only one person discovers the comet, no medal will be given for the discovery.
Otherwise, the medal will be assigned to the discoverer who earliest complies with the condition.
"4.

The communication must not only state as exactly as possible the time of the discovery, in order to settle the question between rival claims, but also as near as may be the place of the comet, and the direction in which it is moving, as far as these points can be determined from the observations of one night.
"5.

If the observations of one night are not sufficient to settle these points, the enunciation of the discovery must still be made, in compliance with the third article.

As soon as a second observation is made, it must be communicated in like manner with the first, and with it the longitude of the place where the discovery is made, unless it take place at some known observatory.