Parameters are accessed with C4DAtom::GetParameter()/ C4DAtom::SetParameter(). See Parameter IDs.
Parameter: Location
GI_REAL_SKY_PAGE_LOCATIONParameter: Global
GI_REAL_SKY_PAGE_GLOBALParameter: Sky
GI_REAL_SKY_PAGE_SKYParameter: Sun
GI_REAL_SKY_PAGE_SUNParameter: Atm
GI_REAL_SKY_PAGE_ATMParameter: Latitude
GI_REAL_SKY_LATITUDEParameter: Longitude
GI_REAL_SKY_LONGITUDEParameter: Time
GI_REAL_SKY_DATETIMEParameter: Time Zone Offset
GI_REAL_SKY_TIME_ZONEParameter: Show Location HUD
GI_REAL_SKY_HUDParameter: Turbidity
GI_REAL_SKY_TURBIDITYParameter: Ozone
GI_REAL_SKY_OZONEParameter: Enabled
GI_REAL_SKY_SKY_ENABLEDParameter: Horizon Line
GI_REAL_SKY_SKY_HORIZONParameter: Use Warm Colors
GI_REAL_SKY_SKY_WARM_COLORSParameter: Use Chroma Color Map
GI_REAL_SKY_SKY_CHROMAParameter: Intensity
GI_REAL_SKY_SKY_INTENSITYParameter: Night Intensity Ratio
GI_REAL_SKY_SKY_INTENSITY_NIGHTParameter: Saturation Correction
GI_REAL_SKY_SKY_SATURATIONParameter: Hue Correction
GI_REAL_SKY_SKY_HUEParameter: Gamma Correction
GI_REAL_SKY_SKY_GAMMAParameter: As Seen Intensity Ratio
GI_REAL_SKY_SKY_SEEN_RATIOParameter: Preview Color
GI_REAL_SKY_SUN_COLORParameter: Enabled
GI_REAL_SKY_SUN_ENABLEDParameter: Use Warm Colors
GI_REAL_SKY_SUN_WARM_COLORSParameter: Shadow Color
GI_REAL_SKY_SUN_SHADOW_COLORParameter: Intensity
GI_REAL_SKY_SUN_INTENSITYParameter: Saturation Correction
GI_REAL_SKY_SUN_SATURATIONParameter: Hue Correction
GI_REAL_SKY_SUN_HUEParameter: Gamma Correction
GI_REAL_SKY_SUN_GAMMAParameter: Size Ratio
GI_REAL_SKY_SUN_SIZE_RATIOParameter: As Seen Intensity Ratio
GI_REAL_SKY_SUN_SEEN_RATIOParameter: Sampling Count
GI_REAL_SKY_SUN_SAMPLING_SAMPLESParameter: Sampling Quality
GI_REAL_SKY_SUN_SAMPLING_QUALITYParameter: Enabled
GI_REAL_SKY_ATM_ENABLEDParameter: Intensity
GI_REAL_SKY_ATM_INTENSITYParameter: Saturation Correction
GI_REAL_SKY_ATM_SATURATIONParameter: Hue Correction
GI_REAL_SKY_ATM_HUEParameter: Gamma Correction
GI_REAL_SKY_ATM_GAMMAParameter: Scene Scale Ratio
GI_REAL_SKY_ATM_SCALE_RATIOParameter: Create Bitmap
GI_REAL_SKY_BITMAPParameter: Create Animation
GI_REAL_SKY_SEQ