That Kṣetradiśā (direction arising from the Rucaka (centre of the cosmos)), which is identified by heat (radiations) of the sun.
tatra tapatīti tāpa iha savitā gṛhyate, tadupalakṣitā kṣetradik tāpakṣetradik. sā cāniyatctyā- ha-
jesiṃ jatto sūro nei tesiṃ tai havai puvvā. tāvakkhittadisāo payāhiṇaṃ sesiyāo siṃ..
(ViBhā 2701 Vṛ p. 149)