Tags:   **Abstract** Historical calendar systems are organized methods developed by different societies to measure   Record   And understand time using distinctive arrangements of days   Months   Seasons   Years   And significant events. Knowledge of such systems can help adults appreciate how different communities have understood and documented time across historical periods. Adult education provides opportunities for adults to acquire knowledge about historical practices and cultural systems through structured learning experiences. This study will examine the effect of adult education on adults’ knowledge of historical calendar systems   With particular attention to their understanding of different calendar structures   Time-reckoning practices   And their historical significance. Adult education can expose learners to historical information through discussions   Lectures   Visual materials   Comparative activities   Timelines   And practical learning exercises. In learning about historical calendar systems   Adults can be introduced to different methods of organizing time and the reasons societies developed particular systems. Learning activities may include the examination of calendar structures   Names of months and periods   Seasonal cycles   Methods of recording dates   And relationships between calendars and historical events. Such experiences can help adults develop a clearer understanding of how systems of time measurement have changed across societies and historical periods. Adults’ knowledge of historical calendar systems refers to their understanding of the structures   Characteristics   Uses   And historical contexts of calendars developed and used by different societies. This knowledge can help adults recognize differences between calendar systems and understand how historical communities organized important dates   Seasons   Festivals   Agricultural activities   And other events. Adult education can strengthen this knowledge by providing opportunities to compare different systems and examine historical evidence relating to timekeeping. Increased knowledge can also support adults’ broader understanding of cultural history and the ways in which societies have interpreted and recorded the passage of time. The study will adopt a suitable descriptive survey research design. The population will comprise adults participating in selected Adult Education programmes   From which an appropriate sample will be selected using a suitable sampling procedure. Data will be collected through a structured questionnaire and an appropriate knowledge assessment designed to measure participants’ knowledge of historical calendar systems. The research instruments will be subjected to appropriate validation procedures   While their reliability will be established before administration. Data collected will be analysed using relevant descriptive and inferential statistical techniques to determine the effect of adult education on adults’ knowledge of historical calendar systems. The study is expected to establish that participation in adult education improves adults’ knowledge of the basic features   Structures   Uses   And historical contexts of different calendar systems. Adults who receive structured learning experiences are expected to demonstrate greater ability to identify differences among calendar systems   Understand their methods of organizing time   And relate calendar practices to historical and cultural activities. The study may further establish that comparative learning activities and visual representations such as timelines and calendar models can make historical time-reckoning concepts easier for adult learners to understand. The study will have implications for Adult Education practitioners   Facilitators   History educators   Cultural educators   And programme developers. It will emphasize the importance of using practical and comparative approaches when presenting historical concepts that may otherwise appear abstract to adult learners. Facilitators may use historical calendars   Timelines   Charts   Visual comparisons   And examples of traditional timekeeping practices to promote active learning. These approaches can make historical learning more engaging while helping adults connect knowledge of calendar systems with broader cultural and historical experiences. The study will be significant to adult learners   Adult Education practitioners   Cultural organizations   Historical researchers   Community learning programmes   And institutions concerned with heritage education. It will recommend the inclusion of relevant historical and cultural learning activities that expose adults to different systems of time measurement and documentation. The study will conclude that adult education can play an important role in improving adults’ knowledge of historical calendar systems while promoting greater understanding of historical timekeeping practices and cultural heritage. **Keywords:** Adult education   Historical calendars   Calendar systems   Time reckoning   Historical timekeeping   Calendar structures   Cultural history   Historical knowledge   Time measurement   Traditional calendars   Calendar development   Historical periods   Cultural heritage   Adult learning   Historical awareness