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Boeer and Moedler composed their celebrated Mappa Selenographica, according to an orthographical projection.
But Herschel was mistaken too, and the observations of Schroeter, Louville, Halley, Nasmyth, Bianchini, Pastorff, Lohrman, Gruithuysen, and especially the patient studies of MM. Boeer and Moedler, were necessary to definitely resolve the question. Thanks to these savants, the elevation of the mountains of the moon is now perfectly known.
Galileo used it, and since Messrs. Boeer and Moedler have employed it with the greatest success. Another method, called the tangent radii, may also be used for measuring lunar reliefs. It is applied at the moment when the mountains form luminous points on the line of separation between light and darkness which shine on the dark part of the disc.
According to him, the colour common to the vast plains, known under the name of "seas," is dark grey, intermingled with green and brown. Some of the large craters are coloured in the same way. Barbicane knew this opinion of the German selenographer; it is shared by Messrs. Boeer and Moedler.
This was said in a tone which quenched Michel Ardan's last hope. The portion of the moon which the projectile was nearing was the northern hemisphere, that which the selenographic maps place below; for these maps are generally drawn after the outline given by the glasses, and we know that they reverse the objects. Such was the Mappa Selenographica of Boeer and Moedler which Barbicane consulted.
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