Vishnupurana 2.7.6

2.7.6

pūrṇe śatasahasre tu yojanānāṃ niśākarāt
nakṣatramaṇḍalaṃ kṛtsnam upariṣṭāt prakāśate //

PARÁŚARA. The sphere of the earth (or Bhúr-loka), comprehending its oceans, mountains, and rivers, extends as far as it is illuminated by the rays of the sun and moon; and to the same extent, both in diameter and circumference, the sphere of the sky (Bhuvar-loka) spreads above it (as far upwards as to the planetary sphere, or Swar-loka). The solar orb is situated a hundred thousand leagues from the earth; and that of the moon an equal distance from the sun. At the same interval above the moon occurs the orbit of all the lunar constellations. The planet Budha (Mercury) is two hundred thousand leagues above the lunar mansions. Śukra (Venus) is at the same distance from Mercury. Angáraka (Mars) is as far above Venus; and the priest of the gods (Vrihaspati, or Jupiter) as far from Mars: whilst Saturn (Sani) is two hundred and fifty thousand leagues beyond Jupiter. The sphere of the seven Rishis (Ursa Major) is a hundred thousand leagues above Saturn; and at a similar height above the seven Rishis is Dhruva (the pole-star), the pivot or axis of the whole planetary circle. Such, Maitreya, is the elevation of the three spheres (Bhúr, Bhuvar, Swar) which form the region of the consequences of works. The region of works is here (or in the land of Bhárata).