What is associated with: around 2700 bc thuban was the north star today this is the north star?

Based on the clue 'around 207 bc the greek stoic philosopher chrysipp...', what is the answer? Based on the clue 'around 240 bc chinese astronomers observed this la...', what is the answer? What is associated with: around 2500 bc the harappan civilization sprung up around this river in pakistan nothwestern i… What is associated with: around 2600 bc pharaoh djoser was entombed in a step one the first large stone structure? Based on the clue 'around 274 bc this republic which later went full ...', what is the answer? What is associated with: around 2750 bc hannu an egyptian sailed down this sea reaching what is now ethiopia somalia? Based on the clue 'around 284 bc zenodotus of ephesus became the firs...', what is the answer? Based on the clue 'around 3 years on the bestseller list this book is...', what is the answer?