Opening mathematical Astronomy by Searching for Orbital Constant that Hidden in variable star cylinder on earth ID 89 1, 2.Department of physics, Dambi Dollo University,Dambi Dollo,Ehiopia Abstract The study of astronomy is needed to integrate variable star with mathematics and science education. In this study we examined the cylinder constant hidden in the formula of the volume of any circular cylinder. Volume of the cylinder(V)= r2h.V= .This Study and digging out the mystery part of a cylindrical coordinate system needed to understand the origin and the nature of celestial (Astronomical) coordinate system that allows Oromo Educators to calculate Oromo Calendar and register it on UNESCO. Keywords:cylinder,height,diameter,circumference, volume, variable constant. 2.Introduction In the history of science, physical science in the geometry, optics, mechanics and astronomy compiled and allowed scientists to develop Physics.This work focused to open the variable star physics experiment in the geometry. Variable stars talk to human kind through their variability. As explained in Serway (2004), Archimedes was the first to compute accurately the ratio of a circle’s circumference to its diameter. 3. Research Question: Can we find a hidden "cylindrical constant" related to variable cylindrical materials 4.Methods: Measurements were taken using local and cultural materials like variable rings, Rope, Qubeelaa Ce'umsaa Figure1.Variablering&Qubeelaa Ce'umsaa 5.Result and Discussion During the variable constant training for every one we have measured the following data is using variable ring. Table 1 No C D 1 51 16.2 The average value of π = = = 3.148 % error = x100%= 0.164% Table 2 .The variable data of the experiment Qubeelaa Ce’umsaa No C D π 1 125.9 40 3.1475 2 126.1 40.1 3.14463804 3 126 40. 3.15 4 126.1 40.1 3.14463804 5 126 40 3.15 Πaverage= =3.147355376 %of error = = 0.1432697% If the percentage error is very small (in variable ring) 0.164% our achievement is 99.836% true. The percentage error of Qubeelaa Ce’umsaa 0.1433% our achievement is 99.867% true. The materials which we use called variable ring and Qubeelaa Ce’umsaa the percentage error is very small which means our experimental error is nearly to the constant or π. π is one of the cylinder constant on the cylindrical objects on the earth. The ratio of volume of cylinder to the product of its circumference, Diameter and height which yield us constant . show the = V = r 2 h ,Since r= ,V= 2 H .Divide both sides for CDH, = Therefore 0.25 is the numerical value of cylinder constant or cylinder geometric pattern. 6.Conclusion We discovered that the origin of π is not solely confined to circular objects, but also extends to ellipses.. The result suggest that the ratio of the volume of a cylinder to the product of its circumference, Diameter, and height is a hidden mathematical constant whose value equal to 0.25.These findings, presented at IAUGA2024, shed light on previously overlooked aspects of physics and geometry. Our work at Dambi Dollo University aims to innovate the study of variable star physics within the context of ancient geometry,contributing the advancement of modern astronomy and sharing our discoveries with the IAU community. 7 .References 1.A text Book of Analytical Geometry of Three Dimensions, by P.K. Jain and Khaleel Ahmed, Published by Wiley Eastern Ltd., 1999.Khaleel Ahmed, Published by Wiley Eastern Ltd., 1999 .2.A text book of Mathematics for BA/B.ScVol 1, by VKrishna Murthy & Others, Published by S. Chand & Company, New Delhi. Delhi.3Archimedes' Secret, transcript ofhe BBC television program Horizon broadcast 14 March 2002;