Verse 27

भजते भावनां स्फारां निश्चितामातताम्बराम् ।ऊर्ध्वं शिरःपीठमयीमधःपादमयीं तथा

In plain words

it takes to a conceiving vast, firm, spreading across the sky — above consisting of the seat of the head, and likewise below of feet,