Animated Hands of a Clock  
The hands of a clock are rotating with different speed.
Cyclic animation of the hands of a clockface.

The Rotations of the Hands of a Clock:
While the hour hand turns 360 degrees just once in 12 hours the minute hand has to turn 12 times more = 360*12 degrees. And again the second hand has to turn another 60 times more = 360*12*60 degrees.
We declare a basic time variable Clock_Time where we can add test values between 0 and 1.

#declare Clock_Time = clock+0.00; // rotation angles in degrees ------------- #declare Rotate_H = Clock_Time*360; #declare Rotate_Min = Clock_Time*360*12; #declare Rotate_Sec = Clock_Time*360*12*60

Accordingly to test a specified time like
  '2h 20min 30sec' we have to declare:

#declare Clock_Time = clock + 2/12 + 20/(720) + 30/(43200);

For a cyclic animation of a 12 hours turn of a clock we should take into account that 12 h = 720 min = 43200 seconds!
So for a small sized cyclic animation it's better not to use the seconds hand. To see the correct running of the seconds hand during a 12 hours turn we need an animation with 43200 frames!
The Jumping of the Minutes and the Seconds:
If we want the hands for minutes and seconds to jump only to full minutes and seconds (each 6 degrees) we should add:

#declare Rotate_Min=int(Rotate_Min/6+0.01)*6; #declare Rotate_Sec=int(Rotate_Sec/6+0.01)*6;

The Hands of a Clock:
To make the look of the clockface size independent we relate all element sizes to the basic clockface radius:

#declare CR = 0.400; // Clockface radius // flatten cylinders we use here; #declare Flat = &l;1,1,0.025>; //----------------------------------- #declare Face_D = 0.001; // length of hands ------------- #declare Hd_H_Len = CR*0.60; #declare Hd_Min_Len = CR*0.85; #declare Hd_Sec_Len = CR*0.95; // radii of the hands --------- #declare Hd_H_D = CR*0.055; #declare Hd_Min_D = CR*0.035; #declare Hd_Sec_D = CR*0.020; // position z of hands -------- #declare Hd_H_Z = CR*0.05; #declare Hd_Min_Z = CR*0.04; #declare Hd_Sec_Z = CR*0.03; //-----------------------------------------

For the hands and marks we use flat cylinders.

// hour hand -------------------- cylinder{ <0,0,0>,<0,Hd_H_Len,0>,Hd_H_D scale Flat rotate <0,0,-Rotate_H> translate<0,0,-Hd_H_Z> texture{ Hands_Texture } } // minute hand ------------------ cylinder{ <0,0,0>,<0,Hd_Min_Len,0>,Hd_Min_D scale Flat rotate <0,0,-Rotate_Min> translate<0,0,-Hd_Min_Z> texture{ Hands_Texture } } // body center ---------------------------- cylinder{ <0,0,-Hd_H_Z>,<0,0,0>,Hd_H_D*1.5 texture{ Hands_Texture } } // face base ------------------------------ cylinder{ <0,0,0>,<0,0, Face_D>,CR texture{ Face_Texture } } //-----------------------------------------

For more details of the clockface and the seconds hand and textures see the according scene file.