Generate a correct and concise answer for the question based on the words in the context.
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Question: Context : The Sinclair Scientific calculator was a 12-function, pocket-sized scientific calculator introduced in 1974, dramatically undercutting in price other calculators available at the time. 
Question : In which year was the service entry date for Sinclair Scientific?

Answer: 1974


Question: Context : 89 Aquarii (abbreviated 89 Aqr) is a binary star system in the equatorial constellation of Aquarius. 
Question : The star 89 Aquarii is a part of the constellation named what?

Answer: Aquarius


Question: Context : SilkAir Flight 185 was a scheduled SilkAir passenger flight from Jakarta, Indonesia, to Singapore, which crashed into the Musi River near Palembang in southern Sumatra, on 19 December 1997, killing all 97 passengers and seven crew on board. 
Question : The date of SilkAir Flight 185?

Answer:
19 December 1997