Some Ans. Questions 2014 by -'Abdu'l-Bahá- 1 Para

Now consider the pervasive influence of the sun upon all earthly beings, and behold what visible effects and outcomes result from its proximity or remoteness, its rising or setting. At one time it is autumn, at another it is spring. At one time it is summer, at another it is winter. When the sun crosses the equinox, the life-giving spring appears in all its splendour, and when it reaches the summer solstice, the fruits attain their full maturity, grains and plants yield their produce, and earthly things attain the plenitude of their growth and development (42:4)

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