INDIAN JOURNAL OF HISTORY OF SCIENCE最新文献

Devasthal observatory, established over a period of ~ 5 decades, is located in the central Himalayan region of Devabhumi in Nainital district of Uttarakhand state, India. Operated and maintained by the Aryabhatta Research Institute of Observational Science (ARIES), its location was selected after an extensive site survey. The first measurements of atmospheric seeing and extinctions at Devasthal were carried out from 1997 to 2001. Since 2010, three optical telescopes with apertures of 1.3, 3.6, and 4 m have been successfully installed at Devasthal. Optical and near-infrared observations taken with these telescopes testify to the global competitiveness of Devasthal observatory for astronomical observations. The article chronicles the collaboration with the Tata Institute of Fundamental Research, beginning around 1996, for the purpose of establishing the observatory. A brief overview of the main science results obtained using these facilities is also presented.

Ayurveda narrates the concept of prakṛti as a framework to understand human behaviour. Prakṛti determines an individual’s physical, physiological, and mental disposition. The three doṣas,vāta, pitta, and kapha, form the basis of the body and mind. The dominance of one or two of these influences the physical and mental makeup of the individual. The lead characters of Kālidāsa’s dramas are studied and analyzed to understand the relevance of prakṛti in literary studies. The concept of prakṛti is helpful for writers to build their characters and in literary criticism. Hence, it should be taught to students of academic studies.

In his comprehensive mathematical treatise Gaṇitakaumudī, Nārāyaṇa Paṇḍita has presented a nuanced, systematic, and elaborate exposition of cyclic quadrilaterals. Here, besides discussing its key properties, Nārāyaṇa fashions a “third diagonal" by interchanging two sides of a cyclic quadrilateral. He also provides a variety of mathematical expressions for computing the area, altitude, circumradius, and so on of a cyclic quadrilateral. It turns out that some of these expressions come out very elegant when we involve the third diagonal in them. In this paper, apart from bringing out the verses of Nārāyaṇa, we also present modern mathematical derivations for the results given by him pertaining to the cyclic quadrilateral.

The first theoretical system of tracking sun in the tropical annual cycle is cryptically mentioned in the Maitrāyaṇīya Āraṇyaka Upaniṣat (MAU) of the Kṛṣṇa Yajurveda, as the southern sojourn of sun starting at the summer solstice. This is called maghādyaṁ, the first point of the maghā nakṣatra, identified most likely with the early morning visibility of ε-Leo, near the azimuth of the sunrise point on the horizon as observed at Kurukshetra. Twenty seven equal nakṣatra sectors named in the traditional sequential order cover one tropical circuit of sun of 366 days with the winter solstice falling exactly at the middle of the śraviṣṭhā sector. Even though MAU mentions each nakṣatra to be made up of four quarters, no practical application of this ¼-nakṣatra sky part amounting to 3º20´ in longitude is seen in Vedic texts till we come to the Brahmāṇḍa Purāṇa, a text closer to the Vedas. This Purāṇa states, observed equinoctial full moon positions corresponding to spring equinox at ¼-kṛttikā and autumn equinox at ¾-viśākha exactly 180º apart as they should be. This statement is analysed in this paper by computer simulation of full moon time series for the years − 2400 to − 800 to show that the Purāṇa data would be realistically valid for the period 1980 BCE to 1610 BCE. It is further demonstrated that the Purāṇa has followed the maghādi system of solar nakṣatra system stated in the MAU. The central epoch circa 1800 BCE of this maghādi equal nakṣatra solar zodiac got modified, due to precession effects, to the śraviṣṭhādi scheme of Parāśara, Vṛddha Garga and Lagadha dateable to circa 1300 BCE.

The first theoretical system of tracking sun in the tropical annual cycle is cryptically mentioned in the Maitrāyaṇīya Āraṇyaka Upaniṣat (MAU) of the Kṛṣṇa Yajurveda, as the southern sojourn of sun starting at the summer solstice. This is called maghādyaṁ, the first point of the maghā nakṣatra, identified most likely with the early morning visibility of ε-Leo, near the azimuth of the sunrise point on the horizon as observed at Kurukshetra. Twenty seven equal nakṣatra sectors named in the traditional sequential order cover one tropical circuit of sun of 366 days with the winter solstice falling exactly at the middle of the śraviṣṭhā sector. Even though MAU mentions each nakṣatra to be made up of four quarters, no practical application of this ¼-nakṣatra sky part amounting to 3º20´ in longitude is seen in Vedic texts till we come to the Brahmāṇḍa Purāṇa, a text closer to the Vedas. This Purāṇa states, observed equinoctial full moon positions corresponding to spring equinox at ¼-kṛttikā and autumn equinox at ¾-viśākha exactly 180º apart as they should be. This statement is analysed in this paper by computer simulation of full moon time series for the years − 2400 to − 800 to show that the Purāṇa data would be realistically valid for the period 1980 BCE to 1610 BCE. It is further demonstrated that the Purāṇa has followed the maghādi system of solar nakṣatra system stated in the MAU. The central epoch circa 1800 BCE of this maghādi equal nakṣatra solar zodiac got modified, due to precession effects, to the śraviṣṭhādi scheme of Parāśara, Vṛddha Garga and Lagadha dateable to circa 1300 BCE.

For a couple of decades, the ‘history of science, technology, and medicine’ (HISTEM) has received widespread attention from scholars worldwide. Historians have paid adequate attention to exploring India's scientific and technological contributions to the global history of science. Simultaneously, the “codified” and “institutionalized” forms of certain medicinal practices and health-seeking traditions of the Indian subcontinent have achieved international recognition for their medicinal values to maintain good health. However, there are many indigenous (tribal/autochthonous/adivashis/marginal) communities whose medicinal practices have remained beyond the purview of HISTEM. In such a background, an intensive study has been undertaken in the context of Indian Sundarbans located in the southern part of North 24 Parganas and South 24 Parganas Districts of West Bengal. Here, the indigenous communities have developed and preserved their medicinal practices, preventive food habits, and folk culture with their long experience of interactions with the available natural elements. This project thus seeks to construct a brief history of diseases, medicinal practices, inheritance and transmission of medicinal knowledge, and the socioeconomic background of the indigenous healers and retailers of medicine of Indian Sundarbans.

For a couple of decades, the ‘history of science, technology, and medicine’ (HISTEM) has received widespread attention from scholars worldwide. Historians have paid adequate attention to exploring India's scientific and technological contributions to the global history of science. Simultaneously, the “codified” and “institutionalized” forms of certain medicinal practices and health-seeking traditions of the Indian subcontinent have achieved international recognition for their medicinal values to maintain good health. However, there are many indigenous (tribal/autochthonous/adivashis/marginal) communities whose medicinal practices have remained beyond the purview of HISTEM. In such a background, an intensive study has been undertaken in the context of Indian Sundarbans located in the southern part of North 24 Parganas and South 24 Parganas Districts of West Bengal. Here, the indigenous communities have developed and preserved their medicinal practices, preventive food habits, and folk culture with their long experience of interactions with the available natural elements. This project thus seeks to construct a brief history of diseases, medicinal practices, inheritance and transmission of medicinal knowledge, and the socioeconomic background of the indigenous healers and retailers of medicine of Indian Sundarbans.