S.D. Const. art. XXVI, § 15

Adjournment after election of senators--Next meeting. Immediately after the election of the United States senators as above provided for, said Legislature shall adjourn to meet at the temporary seat of government on the first Tuesday after the first Monday of January, 1890, at 12 o'clock m.; provided, however, that if the state of South Dakota has not been admitted by proclamation or otherwise at said date, then said Legislature shall convene within ten days after the date of the admission of the state into the union.