The locations were the actual observations was made are far at the center, high altitudes, and in dark open areas. Using the different Limiting Visual Magnitude it shows the relationship with the Population Density of were the observations was made. This study showed Population Density is inversely related to Limiting Visual Magnitude. The correlation of Gemini, Auriga and Population Density has a strong negative relationship. The relationship is negative; as the Population Density increases, the Limiting Visual Magnitude decreases. The relationship between Limiting Visual Magnitude of Gemini, Auriga and Population Density is statistically significant.The study showed that the South West part of Rizal received the most effect of the light pollution. Among the Residential Urban Area in the Municipalities, the Brgy. San Isidro of Angono is the most affected light pollution coming from Metro Manila and its surrounding communities. The Southwest of Rizal has a Mild Light Pollution and the Eastern Rizal has Dark Sky with less Light Pollution. Barangay Quisao of Pililla had the highest value of Limiting Visual Magnitude. Based on the value of Limiting Visual Magnitude, Barangay Quisao of Pililla had the darkest sky. The Limiting Visual Magnitude has significant effect to the quality of the night sky. The value for the Standard Deviation of Gemini is 0.223052 and for Auriga is 0.481217. The highest value Limiting Visual Magnitude of Gemini is 6.3, Auriga 6.1 on Pililla, second Gemini 6.1, Auriga 5.9 on Jalajala. Given the Standard Deviation of Gemini and Auriga it shows the value of Limiting Visual Magnitude on Gemini and Auriga of Pililla has a significant difference on the value of Jalajala.
by: Rose Ann B. Bautista