Detailed Instructions: In this task, you're given a statement, further information available on a particular linked term from the statement, and a question. Your job is to generate the answer to the question by using the information provided. If there is no clear answer obtainable, output 'none'.
Problem:Context: Lord Lindsay's private observatory at Dun Echt, Aberdeenshire. Link Information: Lord Lindsay's private observatory at Dun Echt, Aberdeenshire.  Question: When was the town where Lord Lindsay's private observatory is located founded?
Solution:

Show your work and conclude with the exact phrasing "Therefore, the final answer is [answer]." where [answer] is just the final number or expression that solves the problem.
user
Answer: 1820s 