Chapter 13: The armillary sphere and other instruments

13.1-4 · descriptive (nothing to compute)

the teacher's preparation; the wooden earth-globe, the staff for Meru, the supporting hoops

1. atha gupte śucau deśe snātah śucir alaṅkṛtah/
sampūjya bhāskaraṃ bhaktyā grahān bhāny atha guhyakān//

2. pāramparyopadeśena yathājñānaṃ guror mukhāt/
ācāryah śiṣyabodhārthaṃ sarvaṃ pratyakṣadarśivān//

3. bhūbhagolasya racanāṃ kuryād āścaryakāriṇīm/
abhīṣṭaṃ pṛthivīgolaṃ kārayitvā tu dāravam//

4. daṇḍaṃ tanmadhyagaṃ meror ubhayatra vinirgatam/
ādhārakakṣādvitayaṃ kakṣā vaiṣuvatī tathā//

13.5-9 · computed

hoops at the declinations of the signs, with the day-radii; those of the asterisms and stars

5. bhagaṇāṃśāṅgulaih kāryā dalitais tisra eva tāh/
svāhorātrārdhakarṇaiś ca tatpramāṇānumānatah//

6. krāntivikṣepabhāgaiś ca dalitair dakṣiṇottaraih/
svaih svair apakramais tisro meṣādīnām apakramāt//

7. kakṣāh prakalpayet tāś ca karkyādīnāṃ viparyayāt/
tadvat tisras tulādīnāṃ mṛgādīnāṃ vilomatah//

8. yāmyagolāśritāh kāryāh kakṣādhārād dvayor api/
yāmyodaggolasaṃsthānāṃ bhānām abhijitas tathā//

9. saptarṣīṇām agastyasya brahmādīnāṃ ca kalpayet/
madhye vaiṣuvatī kakṣā sarveṣām eva saṃsthitā//

Computed by: armillaryHoops

13.10-12 · computed

solstices and equinoxes; the ecliptic hoop and the signs on it

10. tadādhārayuter ūrdhvam ayane viṣuvadvayam/
viṣuvatsthānato bhāgaih sphuṭair bhagaṇasañcarāt//

11. kṣetrāṇy evam ajādīnāṃ tiryagjyābhih prakalpayet/
ayanād ayanaṃ caiva kakṣā tiryak tathāparā//

12. krāntisañjñā tayā sūryah sadā paryeti bhāsayan/
candrādyāś ca svakaih pātair apamaṇḍalam āśritaih//

Computed by: eclipticHooparmillaryHoopsCONSTANTS.SINE_OF_OBLIQUITY

13.13-14 · computed

the planets drawn by their nodes; the ascendant, setting and meridian points

13. tato +apakṛṣṭā dṛśyante vikṣepānteṣv apakramāt/
udayakṣitije lagnam astaṃ gacchac ca tadvaśāt//

14. laṅkodayair yathāsiddhaṃ khamadhyopari madhyamam/
madhyakṣitijayor madhye yā jyā sāntyābhidhīyate//

Computed by: latitudesascendantmeridianPoint

13.15 · computed

the sine of ascensional difference between equator and horizon

15. jñeyā caradalajyā ca viṣuvat kṣitijāntaram/
kṛtvopari svakaṃ sthānaṃ madhye kṣitijamaṇḍalam//

Computed by: ascensionalDifference

13.16-22 · descriptive (nothing to compute)

the horizon and Lokaloka; water and quicksilver instruments; the secrecy of the sphere; instruments named

16. vastracchannaṃ bahis cāpi lokālokena veṣṭitam/
amṛtasrāvayogena kālabhramaṇasādhanam//

17. tuṅgabījasamāyuktaṃ golayantraṃ prasādhayet/
gopyam etat prakāśoktaṃ sarvagamyaṃ bhaved iha//

18. tasmād gurūpadeśena racayed golam uttamam/
yuge yuge samucchinnā racaneyaṃ vivasvatah//

19. prasādāt kasyacid bhūyah prādur bhavati kāmatah/
kālasaṃsādhanārthāya tathā yantrāṇi sādhayet//

20. ekākī yojayed bījaṃ yantre vismayakāriṇi/
śaṅkuyaṣṭidhanuścakraiś chāyāyantrair anekadhā//

21. gurūpadeśād vijñeyaṃ kālajñānam atandritaih/
toyayantrakapālādyair mayūranaravānaraih//
sasūtrareṇugarbhaiś ca samyak kālaṃ prasādhayet//

22. pāradārāmbusūtrāṇi śulvatailajalāni ca/
bījāni pāṃsavas teṣu prayogās te +api durlabhāh//

13.23 · data (a constant used)

a copper vessel sinks sixty times in a day and night: the nadi

23. tāṃrapātram adhaśchidraṃ nyastaṃ kuṇḍe +amalāmbhasi/
ṣaṣṭir majjaty ahorātre sphuṭaṃ yantraṃ kapālakam//

Computed by: CONSTANTS.RESPIRATIONS_PER_NADI

13.24-25 · descriptive (nothing to compute)

the man-instrument; the reward of knowing the system

24. narayantraṃ tathā sādhu divā ca vimale ravau/
chāyāsaṃsādhanaih proktaṃ kālasādhanam uttamam//

25. grahanakṣatracaritaṃ jñātvā golaṃ ca tattvatah/
grahalokam avāpnoti paryāyeṇātmavān narah// [māna]