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_15314901_1 (coordinate_velocity_v_dx_dt_in_units_of_c VARCHAR, velocity_angle_η_in_i_radians VARCHAR)

### Question ###
What is the coordinate velocity v dx/dt in units of c total number if the velocity angle η in i-radians is ln[2 + √5] ≅ 1.444?

### Accurate SQL ###

SELECT COUNT(coordinate_velocity_v_dx_dt_in_units_of_c) FROM table_15314901_1 WHERE velocity_angle_η_in_i_radians = "ln[2 + √5] ≅ 1.444"