The night is fading on this last Sunday of February at the top of the Revard. The lights of Aix-les-Bains have gone out and the Lac du Bourget still hosts the remains of a sea of disintegrating clouds. On the horizon, the shadow of the Earth becomes more and more tenuous, surmounted by the colored band of the Venus belt. Present all night, the full Moon of the day before is about to bow out in the west while the Sun is about to rise in the east.