Shiva Purana
आद्रा र्स!मः सदा ज्ञेयः पूजाहोमादितर्पणे । दर्शनं तु प्रभाते च प्रातःसंगवकालयोः ३५ ।
The Vision is to be had at early dawn and within three muhūrtas (two hours twenty-four minutes) thereafter.
english translation
AdrA rsa!maH sadA jJeyaH pUjAhomAditarpaNe । darzanaM tu prabhAte ca prAtaHsaMgavakAlayoH 35 ।
hk transliteration by Sanscript