It takes the moon approximately 29.531 days to orbit the earth once. It takes the earth approximately 365.256 days to orbit the sun once. This means that it takes the moon 6,939.7703125 days to orbit the earth 235 times. And it takes the earth 6,939.864 days to orbit the sun 19 times.

If you could devise a calendar that measured time in lunar months, then adjusted the calendar to allow 235 months in 19 solar years, then, every 19 years, that calendar would be synchronised with the solar calendar.

The Hebrew calendar is just such a solar-lunar calendar. The length of the month is determined by the orbit of the moon. Some months are always 29 days long, some are always 30 days long, and some are sometimes 29 and sometimes 30 days. In addition, every so often (in 7 years of every 19-year cycle) an extra month is added to the year. In this way, the calendar ensures that the festivals fall at the same approximate time of year every year, and, using the fine-tuning described in the last sentences, the Hebrew calendar and the Gregorian solar calendar are synchronised.

Last week I celebrated my 76^th birthday, and, since 76 is 4×19, last Thursday was both my English and my Hebrew birthday. Sometimes the synchronicity is a day out, because of the effect of the irregular Gregorian solar leap-years (every 4 years, but not when the year is divisible by 100, unless it is divisible by 400). However, this year the synchronicity was exact: 29 January fell on 11 Shevat, just as it did in 1950. (For the purpose of this argument, I am assuming that I was born before sunset on January 29. There’s nobody left alive to ask and my brother only remembers that he was playing toy soldiers with his big cousin on the landing of our aunt’s home at the time. He can’t remember whether it was light out.)

To cut a long (76 years and 5 days, at the time of writing) story short, this year I completed four cycles, and that feels like some kind of milestone. I can already almost glimpse 2045, and my 95^th birthday, through the haze on the horizon of the next 19 years.

As if this were not enough to lead to some reflection on the transience of life, these last few weeks have brought a heavy burden of loss.

First, we heard of the death, in a freak work accident, of someone who was a couple of years older than Bernice and myself when we were all teenagers in Hanoar Hatzioni. Even though we had not seen him for many decades, the news of his tragic death came as something of a shock.

Far more painful were the next two deaths, in our closer circle. The first was that of the husband in a couple we became friendly with when they arrived in Maale Adumim from America about a decade ago. Although we had not been in close touch since they moved to Ramat Bet Shemesh a couple of years ago, we, in common with almost all their friends, felt close to them, mainly because of the incredible warmth in which they both bathed everyone they met. The husband suffered painfully with ill health for decades, but you never heard him complaining. Indeed, you never saw him without a smile on his face, and, typically, a joke on his lips. He died far too young, defeated eventually by the disease that he had refused to let define him for so long.

Also last week, my cousin’s wife was taken by a cruel cancer that made her last months a constant struggle to maintain her wonderful spirit. ‘My cousin’s wife’ fails to convey how much a part of the Brownstein family she became almost immediately and remained, over the 52 years since she ‘married in’. Her humour, her warmth, her generosity were always her signature, and she leaves a great emptiness.

Between these two deaths, I learnt that someone I was in Israel with on a year programme 58 years ago had died. We had met again at our programme’s 50^th reunion, and, in fact, Bernice and I shared breakfast with him on the day after the reunion ended, when almost everyone else had already left for home. He was a gentle, quiet-spoken and delightful man.

The sequence of these four deaths, one seemingly leading to another, and all leading up to my birthday, perhaps inevitably led me to reflect on my mortality. It is difficult to escape the sobering fact that, going forward, I can only expect to hear more and more of the same sad news, until the moment when I become the news item. The trick of fooling myself that I am still 18 years old is proving more and more difficult to accomplish.

And yet, at the same time…

I sat in shul a week and a half ago, watching the rows in front of me fill with the sons, sons-in-law and grandchildren of our dear neighbours, marking the Shabbat Chatan of their middle son. To see four generations of the family praying together, to wonder at how tall some of those grandsons are, while remembering their mother as a 9-year-old; to see a granddaughter whose father’s brit I can clearly remember; to remind myself that this family was celebrating not only a wedding, but also the birth of three new grandchildren in the preceding couple of weeks; all of this was to be reminded that just as there are always some stepping off the escalator, there are always, always, others stepping on at the bottom and beginning the long ascent.

And, if I need a reminder even closer to home, I only need to travel up to Zichron, as we did yesterday, and to hold in my arms a stirring, snuffling, warm, smiling (I swear he was, honestly) bundle of vibrantly actual and infinitely potential life. Still feeling his heft in my arms, I am today anchoring myself to the knowledge that, while mortality is individual, immortality is familial, communal, and thereby the stronger force. I can sense the haze lifting just a little on the horizon. I’m feeling ready to take on this fifth cycle!