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_23180638_1 ( peak_position VARCHAR, oricon_albums_chart VARCHAR )

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

### Accurate SQL ###

SELECT COUNT(peak_position) FROM table_23180638_1 WHERE oricon_albums_chart = "Weekly Charts"