वेदों की प्राचीनता एवं काल-निर्णय / ओरायन (लोकमान्य बाल गंगाधर तिलक - खगोलीय वैदिक शोध)
वेदों की प्राचीनता एवं काल-निर्णय / ओरायन (लोकमान्य बाल गंगाधर तिलक - खगोलीय वैदिक शोध)
The Orion and The Arctic Home in the Vedas by Lokmanya Tilak
लोकमान्य बाल गंगाधर तिलक द्वारा
DevanagariHindipublished548 पृष्ठ
पृष्ठ 63, कुल 548 में से
संदर्भ में पढ़ेंपृष्ठ 63
- THE ARCTIC HOME IN THE VEDAS. during winter, whatever the eccentricity of the earth may be. But though these figures are not affected by the eccentricity of the orbit, yet we have seen that the duration of the summer or winter does vary as the eccentricity. Supposing, therefore, that we have the longest winter in the northern hemisphere, we shall have to distribute 229 heat-units over 166 days of a short summer, and 136 heat-units over 199 days of a long winter of the same period. In other words, the difference between the daily average heat in summer and winter will, in such a case, be the greatest, producing shorter but warmer summers and longer and colder winters; and ice and snow accumulated in the long winter will not be melted or removed by the heat of the sun in the short summer, giving rise, thereby, to what is known as the Glacial period in the northern hemisphere. From what has been stated above, it may be seen that the southern hemisphere during this period will have long and cool summers and short and warm winters, a condition precisely reverse to that in the northern hemisphere. In short the Glacial and Inter- Glacial periods in the two hemispheres will alternate with each other every 10,500 years, if the eccentricity of the earth be suffi- ciently great to make a perceptibly large difference between the winters and the summers in each hemisphere. If Dr. Croll had gone only so far, his position would have been unassailable, for the cause, enumerated above, is sufficiently potent to produce the climatic changes attributed to it. At any rate, if this was not the sole cause of a succession of Glacial and Inter-Glacial periods, there could be no doubt that it must have been an important contributory cause in bringing about these changes. But taking the value of the eccentricity of the earth's orbit from the tables of Leverrier, Dr. Croll calculated that during the last three million years there were three periods of maximum eccentricity; the first of 170,000, the second of 260,000, and the third