Write SQL query to solve given problem: How many appearances does the word ID No. 2823 have in the Wikipedia page "Astre"?. Keep the solution inside sql tag ```sql [SQL-Query] ```
SELECT SUM(T2.occurrences) FROM pages AS T1 INNER JOIN pages_words AS T2 ON T1.pid = T2.pid WHERE T1.title = 'Astre' AND T2.wid = 2823