Below is the list of tables from the database along with their columns and datatype. Need to generate an accurate SQL query for the question.
Only use the columns present in the respective table. Only use the columns which are required to generate the SQL query. Only use table joins if required and not otherwise.

### Tables ###
TABLE: CREATE TABLE table_2784 ( "Release" text, "Oricon Albums Chart" text, "Peak Position" real, "Debut Sales (copies)" real, "Sales Total (copies)" real, "Chart Run" text )

### Question ###
How many peak positions were there on the weekly charts?

### Accurate SQL ###

SELECT COUNT("Peak Position") FROM table_2784 WHERE "Oricon Albums Chart" = 'Weekly Charts'