The whole book is written in the chosen language; it cannot be converted after delivery.
Solar (Gregorian) dates are recommended — more accurate.
Hour is local time at the birthplace; longitude converts it to true solar time — a longitude difference can change the hour.
Up to 20 characters each, at most three; answered one by one in Volume 8. Leave blank if you like. Put your story in the section above — this is only for questions, e.g. "Should I change jobs this year?"
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