90
Śrīmad-Bhāgavatam
[Canto 5, Ch. 16]
Mount Sumeru is Brahmapurī, the residence of Lord Brahmā. Each of its four sides is 10,000  yojanas  long. Surrounding Brahmapurī are the cities of King Indra and seven other demigods. These cities are one fourth the size of Brahmapurī.
TEXT 1
राजोवाच
उक्तस्त्वयाभूमण्डलायामविशेषो यावदादित्यस्तपति यत्र चासौ ज्योतिषां गणैश्चन्द्रमा वा सह दृश्यते ॥ १ ॥
rājovāca
uktas tvayā bhū-maṇḍalāyāma-viśeṣo yāvad ādityas tapati yatra cāsau jyotiṣām gaṇaiś candramā vā saha dṛśyate.
rājā uvāca —Mahārāja Parīkṣit said;  uktaḥ —already been said;  tvayā —by you;  bhū-maṇḍala —of the planetary system known as Bhū-maṇḍala;  āyāma-viśeṣaḥ —the specific length of the radius;  yāvat —as far as;  ādityaḥ —the sun;  tapati —heats;  yatra —wherever;  ca —also;  asau —that;  jyotiṣām —of the luminaries;  gaṇaiḥ —with hordes;  candramā —the moon;  vā —either;  saha —with;  dṛśyate —is seen.
TRANSLATION
King Parīkṣit said to Śukadeva Gosvāmī: O brāhmaṇa, you have already informed me that the radius of Bhū-maṇḍala extends as far as the sun spreads its light and heat and as far as the moon and all the stars can be seen.
PURPORT
In this verse it is stated that the planetary system known as Bhū-maṇḍala extends to the limits of the sunshine. According to modern science, the sunshine reaches earth from a distance of 93,000,000 miles. If we calculate according to this modern information, 93,000,000 miles can be considered the radius of Bhū-maṇḍala. In the Gāyatrī  mantra , we chant  oṁ bhūr bhuvaḥ svaḥ . The word  bhūr  refers to Bhū-maṇḍala.  Tat savitur