On the possible reversal of an earth-scale top

• Autorzy: Hara K.
• Języki publikacji: EN

Abstrakty

EN

We work with a theory based on a hypothetical torque corresponding to the revolution gyroscope-effect, an effect ultimately caused by axial precession Φ. Applying this theory to an Earth-scale top, the reversal time from θ ≅ 180° to θ ≅ 0° can be estimated to be roughly 6 x 10⁹ years. The reversal time from θ ≅ 180° to θ = 23.45° , meanwhile, can be estimated to be 4.6 x 10⁹ years. This hypothetical torque can be validated by satellite experiments.

Słowa kluczowe

EN

Earth-scale top; satellite experiments; revolution gyroscope-effect

• Wydawca: Instytut Podstawowych Problemów Techniki PAN
• Czasopismo: Journal of Technical Physics
• Rocznik: 2009
• Tom: Vol. 50, no 4
• Strony: 375--385
• Opis fizyczny: Bibliogr. 26 poz., wykr.

Twórcy

autor

Hara K.

• 5-19-10 Moniwadai, Sendai, Miyagi, 982-0252 Japan,

Bibliografia

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• 15. YOSHIHIRO TERAISHI (1903-1955) once proposed a hypothesis of reversal in the Earth’s obliquity (Ref. [16]) inductively from a study of the Earth’s climatic and biotic histories. His hypothesis is the following: 1. If the Earth and other planets have been formed through the accumulation of planetesimals, as assumed, they can be considered to have been born in the retrograde (θ ≡ 180°) (planetesimals revolve differentially around the Sun, that is, those nearer to the Sun travel at a higher velocity [the differences of the velocities of planetesimals are memorized when planetesimals collide]); 2. The spin axis of the Earth has been rising from θ = 180° (retrograde), has passed through θ = 90° (horizontal state) and θ0 = 23.45° (present obliquity), and will arrive at θ = 0° (prograde) in the long run; 3. The Earth’s obliquity decides on the climate in each geological age; 4. The climate decides the evolution of life. If the Earth’s obliquity has been rising from θ ≡ 180° to θ = 23.45° for 4.6 x 109 years (the age of the Earth), its average variation can be calculated at only θ = -0.000123"/y, a level far too small to observe. Thus, the Teraishi hypothesis must be proved by other methods. This paper proposes this possibility.
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