तन्त्रसार (महामाहेश्वर अभिनवगुप्त - तन्त्रालोक का प्रामाणिक सार-संग्रह सटीक)

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account of caguhing or other factors the portion of amāvasyā
gets into the portion of pratipat, as a result the duration
of the tithi is cut short and therefore the solar eclipse
occurs. The eclipse then obliteraters the difference of the
knowing subjects, the instrument of knowledge and the
objects known ( pramātā, pramāṇa and prameya ), Therefore,
the occasion is considered to be very auspicious because it
bestows other worldly result.
Similarly a year is supposed to get its rise in a single
movement of prāṇa. For this reason the entire course of
the movement of prāṇa and apāna is supposed to correspond
with uttarāyaṇa ( the progress of the sun to the north ), and
dakṣiṇāyāna ( the progress of the sun to the south ). In that
case the tithis occupy only one fffth of a digit and the sun’s
passage from one rāśi to another, that is. the saṃkrāntis
occur in every six digit.
For the purpose of minimising the influence of time the
Yogin further strives to get twelve years to rise in the single
movement of prāṇa and apāna. He locates sixty tithis in
a digit and the passage of one rāśi to another is supposed
to be the duration of a year. Thus he is able to observe
the duration of twelve years in the single movement of prāṇa
and apāna.
Like prāṇa time is thought to arise in apāna. It arises
in the heart and goes down to mulādhāra. Just as Brahmā
and others are supposed to be the superintending deities
residing along different locations, namely, in the heart and
other places as mentioned above, in the same way, they are
said to have their locations in the heart and other places
down to kanda etc. The Yogin should meditate upon the
deitics as the causal agents of stages, namely by boyhood,