Trans.
‘Sir, I know the Rig-veda, the Yajur-veda, the Sama-veda, Atharvana the fourth Veda, as the fifth the Itihasa-Purana, the Veda of the Vedas, the rites of the fathers, Mathematics, the science of portents, the science of Time, Logic, Ethics and Politics, Etymology, the science of the Veda, the science of the Elementals, the science of War, Astronomy, the science of Snake-charming and the fine arts. All this, I know, Sir.’ (p.164)
Source: Chandogya Upanishad and Sri Sankara’s commentary, Trans. By Ganganath Jha, 1923, Madras, the India Printing works
http://archive.org/stream/ChandogyaUpanishadWithShankaraBhashya-EnglishTranslationPart2/04ChandogyaUpanishadWithSankaraBhashya-English-Part2#page/n0/mode/2up
Narada says, adhyemi, 'I study' and lists the disciplines etad bhagavo adhyemi, 'All this I study':
rgveda
yajurveda
samaveda
ātharvaṇa
itihāsapurāṇa (pancamam vedānām
veda ‘grammar’
pitrya ‘science of śrāddha for pitṛ’
rāśi ‘mathematics’
deiva ‘science of portents’
nidhi ‘astronomy (time); science of treasures as propounded by Mahākāla and others’
vākovākya ‘logic’
ekāyana ‘ethics, worldly wisdom’
devavidyā ‘Nirukta (etymology/philology)’
brahmavidyā ‘śikṣā (phonetics), kalpa (rituals), chandas (prosody)’
bhutavidyā ‘science of material substances, physical science’
nakṣatravidyā ‘astronomy (stars and planets); may include kṣatravidyā ‘science of war’ (commentary)
sarpavidyā ‘snake poisons and their antidotes, as propounded by Garuḍa’ (commentary)
devajanavidyā ‘arts developed by celestials, such as music, dance, perfumery, arts and crafts’
Thus, there are two references to astronomy: nidhi (time) and nakṣatra (stars and planets -- in constellation). nakṣatram नक्षत्रम् [न क्षरति; cf. Uṇ.3.15 also] 1 A star in general.-2 A constellation, an asterism in the moon's path, lunar mansion; नक्षत्राणामहं शशी Bg.1.21. नक्षत्र-ताराग्रहसंकुलापि R.6.22; (they are twenty-seven). (Apte lexicon) Note the phrase: ताराग्रहसंकुला that is both stars and planets.