Khandakhadyaka

Khaṇḍakhādyaka (meaning "edible bite; morsel of food") is a Sanskrit-language astronomical treatise written by Indian mathematician and astronomer Brahmagupta in 665 CE.^[1] The treatise contains eight chapters covering such topics as the longitudes of the planets, diurnal rotation, lunar and solar eclipses, risings and settings, the moon's crescent and conjunctions of the planets. The treatise also includes an appendix which in some versions has only one chapter, and in other has three.

The treatise was written as a response to Aryabhata's Ardharatrikapaksa.^[1]

Ama-raja alias Ama-sharman (c. 1200) of Anandapura wrote a commentary titled Vasana-bhashya (IAST: Vāsanābhāṣya) on Khanda-khadyaka during the Chaulukya period. This work refers to earlier commentaries on Bhaskara's text, including those by Lalla (c. 748 CE), Prthudaka-svamin (c. 864), Utpala, and Someshvara (c. 1040).^[2] Khandakhadyaka was known to al-Biruni.^[1]

References

^ ^a ^b ^c Thomas F. Glick; Steven Livesey; Faith Wallis, eds. (2014). Medieval Science, Technology, and Medicine: An Encyclopedia. Routledge. p. 464. ISBN 978-1135459390.
^ David Pingree, ed. (1970). Census of the Exact Sciences in Sanskrit Series A. Vol. 1. American Philosophical Society. p. 50.

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[enc-1] Thomas F. Glick; Steven Livesey; Faith Wallis, eds. (2014). Medieval Science, Technology, and Medicine: An Encyclopedia. Routledge. p. 464. ISBN 978-1135459390.

[2] David Pingree, ed. (1970). Census of the Exact Sciences in Sanskrit Series A. Vol. 1. American Philosophical Society. p. 50.

[1]

[2]

v t e Indian astronomy
Astronomers	Apastamba Aryabhata I Aryabhata II Vainu Bappu Bhāskara I Bhāskara II Baudhayana Brahmagupta Sandip Chakrabarti Radhagobinda Chandra Subrahmanyan Chandrasekhar Amil Kumar Das P. Devadas Gautama Siddha M. K. Das Gupta Jyesthadeva Kamalakara Katyayana Lagadha Lalla Madhava of Sangamagrama Prasanta Chandra Mahalanobis Mahavira Manava Jayant Narlikar Parameshvara Achyuta Pisharati Venkatraman Radhakrishnan J. J. Rawal Megh Nad Saha Jagannatha Samrat Bapudeva Sastri Jai Singh II of Amber Nilakantha Somayaji Sripati Mahendra Suri Govind Swarup Utpala Varahamihira Shankara Variyar Vasistha Yajnavalkya Pathani Samanta
Works	Aryabhatiya Brahmanas Aitareya Brahmana Shatapatha Brahmana Bṛhat Saṃhitā Ganitagannadi Jyotirmimamsa Shulba Sutras Panchangam Khandakhadyaka Mahādevī Makarandasarini Siddhantas Brāhmasphuṭasiddhānta Maha-Siddhanta Pancha-Siddhantika Paulisa Siddhanta Paitamaha Siddhanta Rājamṛgāṅka (astronomy book) Romaka Siddhanta Surya Siddhanta Vasishtha Siddhanta Tantrasangraha Treatise on Astrology of the Kaiyuan Era Vākyakaraṇa Vedanga Jyotisha Vedas Atharvaveda Rigveda Yavanajataka Zij
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Concepts	Axial tilt Azimuth Cardinal direction Celestial equator Celestial sphere Celestial spheres Center of mass Circular orbit Deferent and epicycle Earth's rotation Eccentricity Ecliptic Elliptic orbit Equant Geocentrism Geoheliocentrism Globe Gravity Heliocentrism Hindu units of time Jyotiṣa Kali ahargaṇa Kalpa Karana Manvantara Moonlight Nakshatra Nityayoga Parallax Precession Ritu Spherical Earth Sunlight Tithi Vāra Yuga Zodiacal sign
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Months of the Vedic calendar	Chaitra Vaisakha Jyeshta Aashaadha Shraavana Bhadrapada Ashvin Kartik Margashirsha Pausha Maagha Phalguna