On Earth, daytime and night time occur as a result of exposition to the sunlight, in this way it is day or night on a specific point on the Earth depending on whether this is being illuminated by rays of the Sun at that moment. Additionally, exposition to light depends on the geographical location of the zone, the tilt or inclination of the Earth and the rotation of the planet on its axis that lasts 24 hours.
According to this, in the case of point B it can be inferred in this point it is sunrise because the light is beginning to illuminate this location and due to the rotation of the Earth to the right it is expected in the subsequent hours light exposition increases, which means the day is beginning in point B and therefore the sun is "rising".
