The Mosque is considered as the House of Almighty, Allah SWT, and also a place of worship for Muslims; doing salat, pray, reciting Quran, etc. When doing salat or praying, Muslims need to focus and concentrate, therefore they need a serene atmosphere that can support to focus and concentrate when they are doing the salat or praying and other activities. This condition can happen if the mosque produces a sacred atmosphere.Understanding the meaning of the sacred can vary in each individual. Each individual has her/his way to understand the meaning of sacredness. These differences emerge because of many factors which can influence the meaning of sacredness in a mosque. Therefore this study wants to find out what factors can influence the sacredness of a mosque and whether mosque design is one of the factors which have greatly influenced the sacredness of a mosqueThe research method is a qualitative method using grounded theory. The results of the study stated that the design was the most chosen factor by respondents as a factor influencing the sacredness of the mosque

Daylight entering through the window can be obtained from several sources, namely direct sunlight, clear sky, clouds or reflections of the lower surface and surrounding buildings. Light from each source differs not only in the amount and heat it carries, but also in other qualities, such as color, distribution, and savings. To get natural lighting in the space required large windows or glass walls at least 1/6 of the floor area. Light is the most important part of human life, to get the right lighting in a space, it is necessary to design the right natural lighting according to their needs so that visual comfort can be achieved. Visual comfort is the recommended lighting level that does not exceed the stated threshold and brightness level, and no glare space occurs. Not only to illuminate a room, but the level of lighting also affects the condition of the room created. But visual comfort will be disrupted if glare problems occur. Visual disturbances in the form of "glare" affect visual performance which adversely affects the ability to see. Based on previous research, it was found that the average value of the natural lighting intensity in the reading room of the 3rd floor of the library of Budi Luhur University was 663 lux, this shows that the average value of the natural lighting intensity that occurred exceeded SNI standards and caused glare problems that could interfere with comfort library users, so there needs to be a natural lighting system strategy that can be applied to achieve visual comfort in the library reading room on the 3rd floor. This research was conducted with the main objective is to get a shading device design solution that can reduce glare problems to achieve visual comfort. The research method used in this study is a quantitative research method with an experimental approach. The variables in this study are experimental variables (visual comfort, opening orientation, shading device design) and nonexperimental variables (direct light source, sky conditions, and direct glare). The stages of this research are in the form of; i) identification and data collection in the form of library studies related to natural lighting, visual comfort and shading devices, ii) identification and data collection in the form of library studies related to shading devices, iii) observation of case studies in the form of taking pictures in the form of photographs and work drawings, iv) conducting simulation of several alternative shading devices designs that will be applied to the window openings of the 3rd floor library reading room of Budi Luhur University, v) analysis and synthesis, vi) making research results and drawing conclusions. The results of this study in the form of the most optimal design of shading devices that can reduce lighting intensity is an alternative horizontal overhang 4 design with an overhang width of 200 cm. Whereas the most optimal design of vertical overhang shading devices that can reduce lighting intensity is alternative vertical overhang design 1 with overhang width of 50 cm and verti...