Creating spherical spirals with expressions

I tried to create a spherical spiral using the expression component in grasshopper. The result i am getting is

The desired result is

Can somebody help explain what’s going on…

did you search with the name of the curve you are seeking ? Don’t forget that there are some good search engines. I think you want loxodrome

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Thank you @laurent_delrieu ,that was helpful :raised_back_of_hand: