Shiva Purana
मंडलस्थं महादेवं ध्यात्वाभ्यर्च्य यथाविधि ॥ दद्यादर्घ्यं ततस्तस्मै शिवायादित्यरूपिणे ॥ १६ ॥
Meditating on lord Śiva stationed in the Maṇḍala and worshipping him duly he shall offer Arghya to Śiva in the form of the sun.
english translation
maMDalasthaM mahAdevaM dhyAtvAbhyarcya yathAvidhi ॥ dadyAdarghyaM tatastasmai zivAyAdityarUpiNe ॥ 16 ॥
hk transliteration by Sanscript