How can an astronaut keep the Sabbath in space?


By BibleAsk Team

The concept of observing the Sabbath while aboard a space mission presents unique challenges due to the absence of traditional markers such as sunset and sunrise. For astronauts, who operate in an environment governed by orbital cycles rather than terrestrial timekeeping, maintaining religious practices such as Sabbath observance requires innovative solutions and adaptations. Despite the technological and logistical complexities of space travel, astronauts endeavor to honor their spiritual commitments and traditions while fulfilling their mission objectives. This essay explores the various strategies and considerations involved in keeping the Sabbath in space, emphasizing the importance of adapting religious practices to the demands of space exploration.

The Sabbath Commandment

“Remember the Sabbath day, to keep it holy. Six days you shall labor and do all your work, but the seventh day is the Sabbath of the Lord your God. In it you shall do no work: you, nor your son, nor your daughter, nor your male servant, nor your female servant, nor your cattle, nor your stranger who is within your gates. For in six days the Lord made the heavens and the earth, the sea, and all that is in them, and rested the seventh day. Therefore the Lord blessed the Sabbath day and hallowed it” (Exodus 20:8-11).

When Does the Sabbath Start?

The Bible teaches that the Sabbath begins Friday evening at sunset and ends Saturday evening at sunset. “From evening to evening, you shall celebrate your sabbath” (Leviticus 23:32). For God, who created the heavenly bodies and set them in motion to mark the passage of time (Genesis 1:14), counts time from sunset to sunset. This can be seen in the account in Genesis 1. After dividing day from night, God tells us that “the evening and the morning were the first day” (verse 5). “Evening” is mentioned first, followed by “morning.” God describes each day’s creation in similar terms (verses 8, 13, 19, 23, 31).

Challenges of Sabbath Observance in Space

  1. Absence of Day-Night Cycles: Unlike on Earth, where the Sabbath is typically observed from sunset on Friday to sunset on Saturday, space missions lack the natural rhythm of day-night cycles. Astronauts orbiting the Earth witness multiple sunrises and sunsets within a 24-hour period, making it challenging to discern the beginning and end of the Sabbath according to traditional timekeeping methods.
  2. Synchronization with Earth Time: Astronauts often adhere to Coordinated Universal Time (UTC) or Greenwich Mean Time (GMT) to maintain consistency with mission control and coordinate activities across different time zones. However, aligning Sabbath observance with Earth time may require astronauts to adapt their schedules and routines to accommodate the designated Sabbath hours, which may vary depending on their location in orbit.
  3. Limited Space and Resources: The confined environment of spacecraft presents logistical constraints that can impact religious practices, including the observance of the Sabbath. Limited space for personal belongings and religious artifacts, as well as restricted access to religious texts or materials, may pose challenges for astronauts seeking to observe religious ceremonies while in space.

Strategies for Sabbath Observance in Space

  1. Adaptation of Earth-Based Practices: One approach to Sabbath observance in space involves adhering to the same time frame as one’s home location on Earth. By maintaining continuity with their customary Sabbath observance routines, including prayer, reflection, and rest, astronauts can uphold their spiritual commitments while adjusting to the challenges of space travel.
  2. Utilization of Technology: Astronauts may rely on technological tools and resources to facilitate Sabbath observance in space. For example, electronic devices equipped with timekeeping features and reminders can help astronauts track the passage of time and adhere to designated Sabbath hours, even in the absence of natural cues such as sunrise and sunset.
  3. Establishment of Rituals and Commemorative Practices: In the absence of traditional Sabbath rituals associated with terrestrial settings, astronauts may develop new rituals and commemorative practices tailored to the unique context of space exploration. This may include special observances designed to mark the beginning and end of the Sabbath period.
  4. Consultation with Religious Advisors: Astronauts representing diverse religious backgrounds may seek guidance and support from religious advisors or chaplains to navigate the challenges of Sabbath observance in space. Religious leaders can offer spiritual counsel, facilitate religious services or ceremonies, and provide resources to assist astronauts in maintaining their faith traditions while on mission.
  5. And the space traveler can be assured that the Lord will accept his best service. For the Creator looks at the heart of man (Psalms 139:1) and searches the motives and intents (Jeremiah 17:10). He can read through every action that people take (1 Kings 8:39). And if He sees that a man is willing to obey and does his best towards that end, the Lord accepts his love and worship (John 4:24).

Ethical Considerations

  1. Respect for Religious Diversity: As space exploration endeavors involve multinational and multicultural crews, it is essential to respect and accommodate the religious beliefs and practices of all crew members. Space agencies and mission planners should prioritize inclusivity and cultural sensitivity in accommodating diverse religious observances, including the Sabbath, within the constraints of space missions.
  2. Balancing Mission Objectives and Personal Beliefs: While astronauts are committed to fulfilling their mission objectives and responsibilities, they also have the right to uphold their personal beliefs and religious convictions. Space agencies must strike a balance between operational requirements and the religious freedoms and preferences of astronauts, ensuring that accommodations are made whenever feasible.
  3. Promotion of Ethical Conduct: Sabbath observance in space offers an opportunity to reinforce ethical principles such as rest, reflection, and reverence for life amidst the rigors of space travel. By integrating spiritual values into mission planning and crew training, space agencies can foster a culture of ethical conduct and moral resilience among astronauts, enhancing their well-being and performance.


In conclusion, navigating Sabbath observance in space presents astronauts with unique challenges and opportunities for spiritual adaptation and innovation. Despite the absence of traditional markers such as sunset and sunrise, astronauts can uphold their religious commitments by adapting Earth-based practices, utilizing technology, establishing new rituals, and seeking guidance from religious advisors.

As space exploration continues to advance, it is essential to prioritize the religious freedoms and cultural diversity of astronauts while promoting ethical conduct and spiritual well-being in the pursuit of scientific discovery and exploration beyond Earth’s boundaries. By embracing the challenges of Sabbath observance in space, astronauts exemplify resilience, adaptability, and reverence for the sacred amidst the wonders of the cosmos.

For more on the Sabbath, please check (Lessons 91-102) of the Bible Lessons.

In His service,
BibleAsk Team

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